GRBL postprocessor outputs "asdf" at start of first line

I added a copy of the GRBL Library machine to my workshop, no changes to any settings, everything is default. When I download the sheet, this is what the first two lines look like, exactly:

asdf; Generated by Fabber
; Thu Jan 20 16:04:41 UTC 2022

Other machines aren’t doing this for me. It’s not a blocker because I can just delete those 4 characters myself, but clearly this isn’t expected behavior.

That would be specifically my fault! I had super admin mode turned on and I was testing something! Thanks for the note!

Are toolpaths working OK after you remove that?