DJI Mavic 3 drone 5.1K D-Log mp4 video not working in Final Cut Pro 10.6.9/macOS Sonoma 14.1.1

DJI Mavic 3 drone 5.1K D-Log mp4 video not working in Final Cut Pro 10.6.9 or macOS Sonoma 14.1.1. Updated all those (plus Motion and Compressor) this week and now 5.1K D-Log mp4 video will not play on my Mac. Just shows as black. I was editing video in FCP last weekend in same format with prior version of all those installed and all was fine. Same in Davinci Resolve. But in After Effects this footage works correctly.

Unexpectedly, if I record video in 4K in D-Log mp4 format it will display just fine. Also 5.1K mp4 in Normal (not D-Log) display correctly. Just 5.1K D-Log mp4 will not display anymore.

Have of course also tried several restarts of my Mac. Any insights welcome.

Same problem at the previous version MacOs.

https://discussions.apple.com/thread/254891385