Bridge on Apple silicon Mac mini: video thumbnails not generated (photos fine), same files work on Intel Mac and Windows

Video files show no thumbnails in Adobe Bridge on my new Mac mini, (Goldengate 27.01) while photo thumbnails display normally. The same video files, on the same NAS, or on local desktop show thumbnails correctly in Bridge on an Intel iMac and on a Windows PC.

System

• Mac: Mac mini [M 6, [24 MB], macOS [Goldengate 27.01]
• Bridge: [16.0.x]. I also tried v15.x.x with the same result.
• Other Adobe apps installed: Photoshop, Media Encoder 
• Files are on the Mac drive as well as the office NAS connected over wired Ethernet (SMB). The problem is the same when I copy a file to the Mac’s local drive.

Video files

• All types, all source. both .mov and .mp4 

What I’ve already tried

• Purged the cache for the folder and changed the cache location
• Raised “Do not process files larger than” to 10,000 MB
• Reviewed all thumbnail and video preferences
• Reset Bridge preferences
• Rolled back from Bridge 16 to 15.x.x
• Tested files both on the NAS and locally]

Expected: Video thumbnails appear, as they do on the Intel iMac and Windows PC.
Actual: Videos show a generic icon. Photos are unaffected.

Has anyone seen this on an Apple silicon Mac, and is there a fix? If it’s a known bug, I’d appreciate a workaround and a note on when it will be fixed. Happy to provide logs or a sample file.