More video thumbnails in Explorer.

Overnight, new videos created on my PC no longer display thumbnails (Windows 10 x64 Pro 22H2 last update) except for .wmv and .avi Those who had their thumbnails cached kept them. It's only for videos, no problem for images.
 
I use V1C by default but it's the same with another player. From what I understand, it's the explorer that manages the thumbnails so it's normal that using V1C or something else doesn't change anything. I have tried almost every solution found on the internet. Among other things, I deleted the cache, which just had the effect of obviously removing the existing thumbnails but without rebuilding them.
 
What I don't understand is did it work without problems and then no.