I found the issue will have a patch in an hour
Nice!

Huh, just tested it (on 221025 version) and it _doesn't_ seem to happen with Jewels (but does with rockblox). I guess I misremembered that - unless it's an intermittent glitch, maybe it is in fact only rockblox it happens with, and the typo you found _was_ the cause?
I certainly managed to trigger the bug using other plugins that
did change the backlight timeout, but that also seemingly set it back before quitting. That was a few months ago, though. I'll see if I can still reproduce it.