Ok, I recreated the original file, then just added my line. Same deal as trying via crontab.
Doesn’t run on bootup and now errors out when I try to run it via idle3.
Undo my rc.local edit and reboot, and it runs from idle.
I wonder if it has something to do with my RV3028, which also uses the interrupt pin? I have no idea if its wired to a different GPIO via the Breakout garden, there is no pinout for the mini.
EDIT: It’s not the RV3028. I removed it and it didn’t make any difference.