Premiere imports .mp4 only as audio.

Hello!

I recently updated my premiere to v.12.1.1. and now have a issue where when i try to import video files (.mp4, shot on Sony a7sII), some of the files show up just as audio.

I tried to import through drag and drop, and the import window to no avail.

What seems random is that every time i tried to import again, the files that didn't work seemed to change, i.e. the same file could one time work and the second time not.

My computers specs:

How the files look once imported:

This is truly frustrating as there doesn't seem to be any clear-cut answer to what can be done about this anywhere, and I am working on a tight deadline with this project. Any help or suggestions would be much appreciated.