This issue has been happening since the game launched, but no one has raised it on the forums.
When I contacted support in June of last year, they said they were aware of the issue and were working on it, but it hasn’t been resolved yet.
In FM7, when I unshared it, it stayed in my design and vinyl list!
FH5 doesn’t have this problem either, and it’s something that needs to be fixed quickly.
The same issue occurs on Series X.