diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2b966b8d6..a35774a5c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1104,11 +1104,13 @@ jobs:
           - {os: ubuntu-latest, suite: e2e_bun_lockb, bun: '1.1.45', test_filter: --include-ignored}
           # Bun >= 1.4 migrating a hosted workspace bun.lockb to bun.lock
           # (#803; its reader must be 1.4+) and a vendored one, then
-          # reverting it (#784; skipped by the < 1.2 readers above). Both
+          # reverting it (#784; skipped by the < 1.2 readers above), and a
+          # hosted pin on a record Bun 1.2+ shares between a regular and a
+          # bundled install (#1243; also skipped below 1.2). Both
           # 1.4.2 and 1.3.14 also run the isolated-linker vendored re-run
           # after a late dependent (#861); 1.3 re-hoists a frozen binary lock
           # and refuses one whose trees changed.
-          - {os: ubuntu-latest, suite: e2e_bun_lockb, bun: '1.4.2', test_filter: --include-ignored text_migration workspace_late_dependent}
+          - {os: ubuntu-latest, suite: e2e_bun_lockb, bun: '1.4.2', test_filter: --include-ignored text_migration workspace_late_dependent binary_shared_bundled_record_hosted_pin_is_managed}
           - {os: ubuntu-latest, suite: e2e_bun_lockb, bun: '1.3.14', test_filter: --include-ignored workspace_late_dependent}
           # Real-vlt capstones (DESIGN §8.4): wiremock patch service and a local
           # npm registry fed from npmjs, driven by the pinned vlt release
diff --git a/crates/socket-patch-cli/tests/e2e_bun_lockb.rs b/crates/socket-patch-cli/tests/e2e_bun_lockb.rs
index f07a3031c..b441f9bc8 100644
--- a/crates/socket-patch-cli/tests/e2e_bun_lockb.rs
+++ b/crates/socket-patch-cli/tests/e2e_bun_lockb.rs
@@ -385,6 +385,16 @@ impl Fixture {
             )
             .unwrap();
         }
+        if shape == "bundled" {
+            // REGRESSION (#1243): a local parent that bundles its own
+            // minimist@1.2.2 beside the root's registry minimist@1.2.2.
+            std::fs::write(
+                project.join("bparent-1.0.0.tgz"),
+                bundling_parent_tgz("minimist", "1.2.2"),
+            )
+            .unwrap();
+            package["dependencies"]["bparent"] = json!("file:./bparent-1.0.0.tgz");
+        }
         if shape == "extensions" {
             package["dependencies"]["consumer"] = json!("workspace:*");
             package["dependencies"]["git-number"] = json!("github:jonschlinkert/is-number#7.0.0");
@@ -665,6 +675,44 @@ impl Fixture {
     }
 }
 
+/// A `bparent@1.0.0` tarball that declares `bundleDependencies: [name]`
+/// and ships its own `name@version` under `node_modules/`.
+fn bundling_parent_tgz(name: &str, version: &str) -> Vec<u8> {
+    let manifest = json!({"name":"bparent", "version":"1.0.0",
+        "dependencies":{name: version}, "bundleDependencies":[name]});
+    let bundled = json!({"name":name, "version":version, "main":"index.js"});
+    let files = [
+        ("package/package.json".to_string(), manifest.to_string()),
+        (
+            "package/index.js".to_string(),
+            format!("module.exports = require({name:?});\n"),
+        ),
+        (
+            format!("package/node_modules/{name}/package.json"),
+            bundled.to_string(),
+        ),
+        (
+            format!("package/node_modules/{name}/index.js"),
+            "module.exports = 'bundled';\n".to_string(),
+        ),
+    ];
+    let mut builder = tar::Builder::new(flate2::write::GzEncoder::new(
+        Vec::new(),
+        flate2::Compression::default(),
+    ));
+    for (path, body) in &files {
+        let mut header = tar::Header::new_gnu();
+        header.set_size(body.len() as u64);
+        header.set_mode(0o644);
+        header.set_mtime(0);
+        header.set_cksum();
+        builder
+            .append_data(&mut header, path, body.as_bytes())
+            .unwrap();
+    }
+    builder.into_inner().unwrap().finish().unwrap()
+}
+
 fn make_tgz_from_installed(pkg_dir: &Path, replaced_index: &[u8]) -> Vec<u8> {
     let pkg_dir = pkg_dir
         .canonicalize()
@@ -1031,6 +1079,115 @@ async fn native_binary_hosted_vendored_takeover_roundtrip() {
     fixture.frozen("rolled-back", &fixture.original, "minimist");
 }
 
+/// REGRESSION (#1243): Bun 1.2+ keeps ONE `bun.lockb` record for a
+/// version installed both from the registry and bundled inside a parent's
+/// tarball. The hosted scan wires that record for the regular install
+/// (warning that the bundled copy stays unpatched); the pin it wrote must
+/// then be listed and unwound like any other: `list` succeeds, the online
+/// hosted → vendored takeover restores the registry record and vendors over
+/// it, and `vendor --revert` gives back the pre-hosted bytes exactly.
+#[tokio::test(flavor = "multi_thread")]
+#[serial_test::serial]
+async fn binary_shared_bundled_record_hosted_pin_is_managed() {
+    let Some(fixture) = Fixture::new("bundled") else {
+        return;
+    };
+    let server = MockServer::start().await;
+    mock_api(&server, &fixture, "minimist").await;
+    let project = &fixture.project;
+    let uri = server.uri();
+
+    let hosted = scan(project, &server, "hosted", &[]);
+    assert_eq!(hosted["redirect"]["redirected"], 1, "hosted scan: {hosted}");
+    let text = hosted.to_string();
+    let shared =
+        text.contains("redirect_bun_bundled_instance_skipped") && text.contains("also bundled");
+    if !shared {
+        // Bun < 1.2 records no bundled flag on the regular record; that
+        // shape is the ordinary hosted pin the other tests cover.
+        eprintln!("SKIP #1243 leg: this Bun keeps no shared bundled record: {hosted}");
+        return;
+    }
+    assert_ne!(fixture.lock(), fixture.original_lock);
+
+    // `--patch-server-url`: the mock serves the hosted artifact, so name
+    // it the hosted origin (as the vendor run below does).
+    let (code, listed) = cli_code(project, &["list", "--patch-server-url", &uri]);
+    assert_eq!(
+        code, 0,
+        "list must accept the hosted pin it wrote: {listed}"
+    );
+    assert!(
+        !listed.to_string().contains("hosted_wiring_contested"),
+        "{listed}"
+    );
+    assert!(
+        listed.to_string().contains(PURL),
+        "list names the hosted pin: {listed}"
+    );
+
+    // The npm registry's version document for minimist@1.2.2, served
+    // locally (see native_binary_hosted_vendored_takeover_roundtrip).
+    let integrity = "sha512-rIqbOrKb8GJmx/5bc2M0QchhUouMXSpd1RTclXsB41JdL+VtnojfaJR+h7F9k18/4kHUsBFgk80Uk+q569vjPA==";
+    Mock::given(method("GET"))
+        .and(path("/minimist/1.2.2"))
+        .respond_with(ResponseTemplate::new(200).set_body_json(json!({"dist": {
+            "tarball": "https://registry.npmjs.org/minimist/-/minimist-1.2.2.tgz",
+            "integrity": integrity}})))
+        .mount(&server)
+        .await;
+    fixture.stage();
+    let taken_over = cli_env(
+        project,
+        &[
+            "vendor",
+            "--patch-server-url",
+            &uri,
+            "--vendor-source",
+            "service",
+        ],
+        &[("SOCKET_NPM_REGISTRY", &uri)],
+    );
+    assert_eq!(
+        taken_over["summary"]["applied"], 1,
+        "online vendor over the shared hosted pin: {taken_over}"
+    );
+    assert!(
+        taken_over["events"].as_array().is_some_and(|events| events
+            .iter()
+            .any(|e| e["errorCode"] == "vendor_takeover_reverted_redirect")),
+        "the takeover is reported: {taken_over}"
+    );
+    assert!(
+        !taken_over
+            .to_string()
+            .contains("vendor_lock_entry_not_found"),
+        "{taken_over}"
+    );
+    let vendor_lock = fixture.lock();
+    assert!(
+        !vendor_lock.windows(uri.len()).any(|w| w == uri.as_bytes()),
+        "no hosted URL is left in bun.lockb"
+    );
+
+    let reverted = cli(project, &["vendor", "--revert", "--offline"]);
+    assert_eq!(
+        fixture.lock(),
+        fixture.original_lock,
+        "the revert restores the pre-hosted bytes exactly: {reverted}"
+    );
+
+    // `rollback` of the same pin refuses it as any binary hosted pin is
+    // refused (the checkout remedy), not as contested wiring.
+    let hosted = scan(project, &server, "hosted", &[]);
+    assert_eq!(
+        hosted["redirect"]["redirected"], 1,
+        "hosted again: {hosted}"
+    );
+    rollback_refuses_binary_hosted_pin_then_checkout(&fixture, &server);
+    assert_eq!(fixture.lock(), fixture.original_lock);
+}
+
 #[tokio::test(flavor = "multi_thread")]
 #[serial_test::serial]
 async fn native_binary_scan_vendored() {
diff --git a/crates/socket-patch-core/src/vex/discover/bun.rs b/crates/socket-patch-core/src/vex/discover/bun.rs
index 19da490fc..f2d01fb1d 100644
--- a/crates/socket-patch-core/src/vex/discover/bun.rs
+++ b/crates/socket-patch-core/src/vex/discover/bun.rs
@@ -230,6 +230,31 @@ impl Bundled {
         }
     }
 
+    /// Record a `bun.lockb` record Bun shares between a regular and a
+    /// bundled install: it is classified as the regular install, so a ref
+    /// it makes is kept for [`Bundled::contest`] to shadow (never attested,
+    /// but still a pin list / rollback / remove / the vendored takeover can
+    /// unwind), and its `name@version` is recorded as a bundled copy.
+    fn share(&mut self, ctx: &DiscoverCtx<'_>, file: &str, entry: Entry<'_>, out: &mut Discovery) {
+        let (label, name) = (entry.label.to_string(), entry.name);
+        let recorded = entry.recorded_version;
+        let mut alone = Discovery::default();
+        classify(ctx, file, entry, &mut alone);
+        out.diagnostics.extend(alone.diagnostics);
+        let mut purls: Vec<String> = alone.elsewhere.into_iter().map(|e| e.purl).collect();
+        for r in alone.refs {
+            purls.push(r.purl.clone());
+            out.push(r);
+        }
+        if purls.is_empty() {
+            purls.extend(recorded.and_then(|version| npm_purl(name, version)));
+        }
+        for purl in purls {
+            out.resolved_elsewhere(file, Some(purl.clone()));
+            self.copies.entry(purl).or_insert_with(|| label.clone());
+        }
+    }
+
     /// Withdraw every ref of `file` whose `name@version` a bundled copy in
     /// the same lock also installs: that copy stays unpatched beside it.
     fn contest(&self, file: &str, out: &mut Discovery) {
@@ -302,9 +327,13 @@ async fn extract_binary(ctx: &DiscoverCtx<'_>, out: &mut Discovery) {
         // A record some bundled edge reaches installs (also) as a copy
         // unpacked from that parent's tarball. Bun keeps ONE record for a
         // regular and a bundled install of the same version, so even a
-        // record a regular edge also reaches is never attested.
-        if p.bundled {
+        // record a regular edge also reaches is never attested; its ref is
+        // still the pin the hosted writer wired for that regular install
+        // (#1243), so it is shadowed rather than dropped.
+        if p.bundled_only {
             bundled.record(ctx, BUN_LOCKB, classified, out);
+        } else if p.bundled {
+            bundled.share(ctx, BUN_LOCKB, classified, out);
         } else {
             let user_tarball =
                 p.version.is_none() && user_tarball_version(&p.name, &p.resolution).is_some();
@@ -1725,6 +1754,20 @@ mod tests {
                 "{shape}: {:?}",
                 diag_codes(&out)
             );
+            // REGRESSION (#1243): a record Bun shares with a regular install
+            // is the pin the hosted writer wired for that install, so it is
+            // shadowed (visible to list / rollback / remove / the vendored
+            // takeover), like the text lock's regular entry beside a bundled
+            // one. A record only bundled edges reach wires nothing.
+            let shadowed: Vec<_> = out
+                .shadowed
+                .iter()
+                .map(|r| (r.purl.as_str(), r.uuid.as_str()))
+                .collect();
+            match shape {
+                "both" => assert_eq!(shadowed, [("pkg:npm/is-number@7.0.0", UUID_A)], "{shape}"),
+                _ => assert!(shadowed.is_empty(), "{shape}: {shadowed:?}"),
+            }
         }
     }