**System Information**
Operating system: Linux Mint 19.3 (also tested on windows 10)
**Blender Version**
Broken: 3.0.1
Worked: Gooseberry
**Exact steps for others to reproduce the error**
Create a rig, link the group into a new file, create a library override.
Enable the BF selection sets addon.
Create some selection sets.
Save file and reopen.
The selection sets will all now be identical to the first one you created in both name and content.{F12891058}