Many covers of albums not seen in iPhone

Since a few days many covers of albums are no longer seen in the list of albums with my iphone 12 pro Max 512 Go (iOS 14.6). If i click on the album the cover is present.

No problem with imac and ipad.

I have erased cache in the settings on iphone. I have deleted app Roon and installed again. The problem isn’t solved.

What can i do?

Thanx. Didier

New update but still same problem!

Any idea?

After last update it’s ok now. Thank You very much.