Ok, I've got it: in the broken workspaces the contents of`.dendron.ws` is:

{"version":"dendron-cli","activationTime":1651261068366}

While in the functional ones it reads

{"version":"0.92.1","activationTime":1651260924093}

If I manually change the string

"dendron-cli"

in the broken workspaces'

.dendron.ws

, everything functions as expected