Some soundtracks do not install where they are supposed to, instead of the drive picked and the music folder in the Steam library, they end up in the Steam program folder on the system drive.

Windows 11

1. Install any of these soundtracks:
   https://psteamproxy.yuanyoumao.com/app/1391440/The_Sojourn_Soundtrack/
   https://psteamproxy.yuanyoumao.com/app/1376680/Paper_Dolls_Soundtrack/
   https://psteamproxy.yuanyoumao.com/app/1250830/Operencia_The_Stolen_Sun__Explorers_Pack/
   
2. Pick a different drive than C: as an install destination.
   
3. After installing, display the soundtrack in the client and browse local files.

The folder opened will be located straight in the Steam folder on C: instead of the music folder in the Steam library on my other drive.

The soundtrack should be installed in the right location.

Through printing the app info in the console, I've noticed that all three soundtracks that are doing this for me have something in common. The value config.installdir includes an escaped (double) backslash.
That is the common factor I've found so far, that does not appear in other working soundtracks that I've looked at. It is seemingly breaking something that decides where to install the files.

As a last detail, this is not a new issue for the current beta, this has been a problem for a few years at least.