Empty folder in mediabay (right zone). CB12

I think it’s something from cubase12 since I’ve updated I’m noticing strange performances and one of them is this when I paste a sound library in my main folder I see the folder inside mediabay but without any content, many times the folder doesn’t even come out in mediabay , something strange is that when I see mediabay pressing F5 there is if the library comes out but in rightzone nothing appears.

Note: 1.I have rescanned
2.I have copied my library to another hard drive.
3.I have recivized the format of the files.