Hi Tim!
When I open a session and do changes and then pause Obsession it doesnt seem to save anything. This can be tested by opening the session after layout changes.
But when I use :Obsession command twice so it says that it stops and track again.. and do some changes and then :Obsession to pause.. it actually saves the changes such as layout etc.
I use
:source ~/.config/nvim/sessions/test
to open the session up.
Not sure how to get logs for this behaviour.