Example is the FE /god command.
Using /god on will result in Player does not exist, or is not online error.
This seems to happen because no playername was inserted in the action
permset user @player deny fe.protection.damageby.*.

@spacebuilder2020 I guess this has to do with your changes - please fix asap!

But /god off works the same way, and it works, so that doesn't really explain it.

/god on used to work.... Give me a sec to diagnose this.

/god on is technically working. It sets the permission correctly, but fails at the /heal operation.

I am trying to investigate why it thinks the player is invalid.

Make sure that you have the correct version of /god

The script on my instance was out of date. When I deleted the god.json file and let it regen, it worked fine.

@spacebuilder2020 it should not have changed....

See 33f6ce0

Ah I see now - /heal in the command cannot heal the current player any more because it does not seem to be passed to the command maybe?

So it can't heal the server

Actually, it is being told to run the command as a server

Ok after some more checking I noticed, that it probably already didn't work before your changes - and as it seems you fixed it already...
(So it was only the old json file in my env)