Meta AI Mac app screen sharing fails silently on macOS 13.6

Downloaded the new Meta AI Mac build (version 1.0.3, arm64) yesterday hoping the window-sharing feature would finally let me offload boilerplate refactoring to an LLM while I stay in VS Code. Instead, the "Share Window" button spins for ~3 seconds, then returns to idle with zero console output. No overlay, no permission prompt, no sandbox violation in Console.app — just nothing.

Here's what I've ruled out so far:

Environment

• MacBook Pro M2, macOS 13.6.1 (Ventura)
• SIP enabled, no third-party kernel extensions
• Screen Recording permission granted to com.meta.aimac in System Settings → Privacy & Security
• Accessibility permission also granted (tried both with/without)

What the logs actually show
log stream --predicate 'subsystem == "com.meta.aimac"' --level debug yields this when I click Share Window:

2024-12-19 14:22:11.342 MetaAI[12487]: [ScreenCapture] Requesting capture permission for window 0x7f8b...
2024-12-19 14:22:11.344 MetaAI[12487]: [ScreenCapture] CGWindowListCreateImage returned NULL for window 0x7f8b
2024-12-19 14:22:11.345 MetaAI[12487]: [ScreenCapture] Falling back to full-screen capture
2024-12-19 14:22:11.347 MetaAI[14:22:11.347 MetaAI[12487]: [ScreenCapture] SCShareableContent.current.excludingDesktopWindows: false
2024-12-19 14:22:11.348 MetaAI[12487]: [ScreenCapture] No shareable content found, aborting

The CGWindowListCreateImage returning NULL is the smoking gun. That window ID (0x7f8b) belongs to my VS Code instance — confirmed via CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID). The app sees the window but can't snapshot it.

Things I've tried that didn't work
1. Restarting the Mac (twice)
2. Revoking/re-granting Screen Recording permission via tccutil reset ScreenCapture com.meta.aimac
3. Running Meta AI from Terminal with --enable-logging=verbose — no additional output
4. Disabling "Displays have separate Spaces" in Mission Control (some ScreenCaptureKit apps choke on this)
5. Testing with a non-Electron window (Terminal.app) — same NULL return

Workaround that kind of works
If I choose "Share Entire Screen" instead of a specific window, the overlay appears and the model can read my screen. But that defeats the privacy model — I don't want the LLM seeing my password manager or private Slack DMs. The per-window path is explicitly advertised in their launch blog post, so this feels like a regression, not a missing feature.

Suspected root cause
The SCShareableContent.current.excludingDesktopWindows: false line suggests they're filtering out desktop-level windows, but VS Code on Ventura registers as a regular app window (layer 0, not the desktop layer). Something in their window-filtering logic is misclassifying Electron/Chromium windows on macOS 13. The fallback to full-screen capture then fails because excludingDesktopWindows: false excludes everything.

Ask
Has anyone gotten per-window sharing working on Ventura (13.x)? Specifically with Electron-based editors (VS Code, Cursor, Zed)? I'm wondering if this is a ScreenCaptureKit version mismatch — the app bundles its own ScreenCaptureKit.framework stub, but Ventura's system version is 1.0 while Sonoma ships 2.0. If they compiled against the Sonoma SDK but didn't weak-link properly, the SCShareableContent query could return empty on older macOS.

If you're on Sonoma 14.x and it works, that would confirm the version-gate theory. Also happy to test a TestFlight build if the Meta team monitors this forum.