diff --git a/.github/workflows/fresh-install-tests.yml b/.github/workflows/fresh-install-tests.yml
index 6596724f76..6d6ed4a452 100644
--- a/.github/workflows/fresh-install-tests.yml
+++ b/.github/workflows/fresh-install-tests.yml
@@ -11,9 +11,6 @@ name: Fresh Install Tests
 # so test tooling churn doesn't cause false positives.
 
 on:
-  push:
-    branches:
-      - package-upgrades
   schedule:
     - cron: "0 2 * * *" # Daily at 02:00 UTC
   workflow_dispatch: # Allow manual runs
@@ -67,6 +64,19 @@ jobs:
           echo "Updating prod deps for: $FILTERS"
           eval pnpm update --prod $FILTERS
 
+      - id: dedupe_deps
+        name: Dedupe transitive dependencies
+        # After bumping the publishable packages' prod deps, collapse any
+        # duplicate transitive resolutions (e.g. @tiptap/core + @tiptap/pm)
+        # that would otherwise differ between the updated publishable packages
+        # and the un-updated examples/playground. Without this, TypeScript
+        # treats the two copies' exports as unrelated types and example-editor
+        # fails to build (TS2322 on Extension<any, any> vs AnyExtension).
+        # Dedupe only rewrites the lockfile — it does NOT modify package.json,
+        # so the examples' "@blocknote/*": "latest" specs (which is what
+        # CodeSandbox users see) stay intact.
+        run: pnpm dedupe
+
       - id: build_packages
         name: Build packages
         run: pnpm run build
@@ -106,6 +116,8 @@ jobs:
             failed_step="Install dependencies"
           elif [ "${{ steps.update_prod_deps.outcome }}" = "failure" ]; then
             failed_step="Update prod deps of published packages"
+          elif [ "${{ steps.dedupe_deps.outcome }}" = "failure" ]; then
+            failed_step="Dedupe transitive dependencies"
           elif [ "${{ steps.build_packages.outcome }}" = "failure" ]; then
             failed_step="Build packages"
           elif [ "${{ steps.run_unit_tests.outcome }}" = "failure" ]; then
diff --git a/packages/core/src/blocks/ListItem/NumberedListItem/IndexingPlugin.test.ts b/packages/core/src/blocks/ListItem/NumberedListItem/IndexingPlugin.test.ts
index d10d4b08f1..433fa47806 100644
--- a/packages/core/src/blocks/ListItem/NumberedListItem/IndexingPlugin.test.ts
+++ b/packages/core/src/blocks/ListItem/NumberedListItem/IndexingPlugin.test.ts
@@ -1,5 +1,5 @@
 import { Selection } from "prosemirror-state";
-import { describe, expect, it } from "vitest";
+import { afterEach, describe, expect, it } from "vitest";
 
 import { BlockNoteEditor } from "../../../editor/BlockNoteEditor.js";
 
@@ -9,9 +9,22 @@ import { BlockNoteEditor } from "../../../editor/BlockNoteEditor.js";
 
 const PLUGIN_KEY = "numbered-list-indexing-decorations$";
 
+// Track editors created in each test so we can unmount them in afterEach —
+// otherwise prosemirror-view's DOMObserver leaves a setTimeout alive that
+// fires after vitest tears down jsdom, throwing
+// `ReferenceError: document is not defined` and failing the run.
+const activeEditors: BlockNoteEditor<any, any, any>[] = [];
+
+afterEach(() => {
+  while (activeEditors.length) {
+    activeEditors.pop()!.unmount();
+  }
+});
+
 function createEditor() {
   const editor = BlockNoteEditor.create();
   editor.mount(document.createElement("div"));
+  activeEditors.push(editor);
   return editor;
 }