Yeah, it's to do with a standalone app
I created with tasker that uses auto input. It won't work because I can't enable the accessibility settings for it post an update. The app appeared in accessibility settings after my upgrade to nought (was missing in marshmallow) and would work, so I did an update to the app and reinstalled it, at which point it disappeared from accessibility and stopped working (still works in tasker though) . I'm hoping that rerunning optimisation might make it appear again and work