Alright this is slightly frustrating... and not documented anywhere that I can find.
If you create a chain, then switch to a pattern, the scene will always save the chain, despite the pattern running. So once I create a chain on a track, I have to create chains to save scenes... because I can't figure out how to delete a chain. Erase > Chain does nothing.
Is there anyway to erase a chain? If not, always requiring a chain seems error prone because you can accidentally save the backgrounded chain when the pattern is forward (as I've been doing for the past week).
Also haha the naughties called and wants its captcha back...