Product Thumbs missing in the backend

[silence444]

Good afternoon everyone
I recently updated to 3.0.12 and all the thumbnails Products->Products section are not showing. They show fine on the frontend.
I have searched but i can't seem to find anyone that has had the same issue. I created a new product but still nothing. What I did notice is that if there are more than 30 products then they thumbnails show again on page 2 but nothing on page 1.
Anything would be most appreciated!

Thank you for your time