Preview will not load

So about half my images (~20.000) suddenly lost their previews and they will not load on their own.

I can select an image and the it'll show, but besides that it's all greyed out boxes. 

I have looked through solutions of people having a similar issue and they have not worked.

I have tried to simply rebuild previews (it then processeds to process new previews for a few hours but nothing actually happens, despite it taking a fair bit of CPU usage).

I have deleted the "Previews.lrdata" file and build previes.
I have moved all images to a new catalog, but that in a new place on another harddrive and attempted to build new previews there. 

All for naught. 

If someone have some suggestions it would be appreciated.

It's on windows 11.