Ahhh - now its behaviour makes sense. I still wonder, though, if it needs to be uid 1000 for that guest? So much simpler if it isn’t…
Default behaviour would be for the Guest to be created with 1001 providing that 1000 was already present - so altering it would be easy enough - either by time of creation of ‘main user’ account, or modifying the Guest creation with -u to force a uid…