Even trying to do it via CLI it does the same. Originally it didn't even show that vsys1 was an available vsys after the settings default-vsys command until I tried to enter it once (which it didn't complain about). Compare to running config does not show any change to 'settings'. You cannot force commit the change either.
admin@M100-01(primary-active)# set template TEMPLATE1 settings default-vsys vsys1
Commit job 54836 is in progress. Use Ctrl+C to return to command prompt
template -> TEMPLATE1 is missing 'settings'
template is invalid
Click Accept as Solution to acknowledge that the answer to your question has been provided.
The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!
These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!
The LIVEcommunity thanks you for your participation!