Photos thumbnails hang on /api/photos/thumb/ in umbrelOS 2.0.0-beta.1

Environment

• Umbrel Pro
• umbrelOS 2.0.0-beta.1
• New Photos app

Problem

Photos displays solid-colour placeholders instead of photo thumbnails.

Diagnostics

• Original photo files are intact and readable.
• File index reconciles successfully.
• Existing cached thumbnails are valid WebP files.
• Adding a new JPEG immediately generates 192, 512 and 1280 WebP thumbnails.
• Database records for the newly generated thumbnails show state=ready, failure_count=0, and no error.
• Despite this, Photos still displays placeholders.
• Network inspection shows Photos requesting /api/photos/thumb/<hash>?s=512&token=....
• Authenticated thumbnail requests receive 0 bytes and hang.
• Reproduced with two different thumbnails using curl; both timed out after 10 seconds with 0 bytes received.
• An unauthenticated request to the same endpoint immediately returns HTTP 401, confirming the endpoint itself responds.
• No corresponding error appears in journalctl -u umbrel.service while the authenticated request is hanging.

Expected

/api/photos/thumb/ should return the generated WebP thumbnail and Photos should display it.

Actual

Authenticated thumbnail requests hang indefinitely with 0 bytes returned, leaving Photos showing coloured placeholders.

I have not deleted or rebuilt the file index, database, or thumbnail cache because thumbnail generation and database state appear healthy.