Yeah. Now I'll have to wait for every mod to be updated to have a black thumbnail to match the rest. Not just that but like that one guy said, the black background does seem to sort of "patronize" the cars a little. Very annoying change the devs made for no reason.
What if the devs did this so that we as users can easily determine what is a mod/custom config vs vanilla content? Sure its ugly but even i've struggled with that sometimes