I am having the same issue - Starring Files/Folders in the Home tree works completely at random.
Some Folders and Files in Home that can be Starred are created by me, others came with the system. Folders that I can star do not allow their inside files and folders to be starred.
Should I register and report this at tracker.pureos.net? Registering for PureOS bug tracker
I just got my first Librem laptop, namely 14’ running:
ID=pureos
NAME=PureOS
PRETTY_NAME=PureOS
VERSION_ID=10.0
VERSION_CODENAME=byzantium