macOS desktop: file-link right-click menu disappears when hovering the "Open in…" submenu

What happened

Right-clicking a local file link in the chat/transcript opens the context menu and the top items render fine (Copy path, etc.). But the moment I move down to hover the "Open in…" submenu, the entire context menu dismisses/disappears before the submenu opens. I can never reach the submenu items.

This worked reliably for a long time and broke recently (no config change on my end).

Expected

Hovering "Open in…" should expand the submenu so I can open the file in Finder / the default app, as it did previously.

Steps to reproduce

1. Right-click a local file link in the chat transcript.
2. Context menu appears; top items (Copy path / Copy relative path / Copy filename) are present.
3. Move the cursor down to hover "Open in…".
4. Entire context menu disappears instead of expanding the submenu.

Environment

• macOS 25.3.0 (Darwin 25.3.0)
• Claude desktop app v1.12603.1
• Reproducible: every time

Notes

Possibly related to #65628 (file context menu "Open in → Finder" does nothing), but the failure mode is different: in my case the menu dismisses on hover of the submenu, so the submenu items are never reachable (vs. clicking the item and nothing happening). Copy-path items still work.

Workaround

Copy path, then in Terminal open -R "<path>" (reveal in Finder) or open "<path>" (default app).