Video appears black in timeline and source window when editing H.264 on M1 Max

I was editing a project for about a week with no issues, then the video recently went back. The audio is still there. The clips appear in the bin, there is no "Media Offline" notification.

Here are the properties: Type: MPEG Movie File Size: 9.31 GB Image Size: 4096 x 2160 Frame Rate: 23.976 Source Audio Format: 48000 Hz - 24-bit - Stereo Project Audio Format: 48000 Hz - 32 bit floating point - Stereo Total Duration: 00:08:45:12 Pixel Aspect Ratio: 1.0 Alpha: None Color Space: Rec. 709 Color Space Override: Off Input LUT: None Video Codec Type: MP4/MOV H.264 10 bit 4:2:2