If i try to make a subproject Backup, I get this "error".

After some time I get this.

My project gets stuck active and I need to activate another project and reactivate the subproject again.

However backup is completed well and I can use without problems.
If I try to make another Project Backup it finished normally for some time until I start getting this error again.
I might have made some changes with SQL server managment studio 22, but cant remember.