Is there a known bug with this?

[tobindax]

I noticed an addon that was advertised to go idle when not 'Out of Combat', it was occasionally running with high CPU usage [edit: RARELY, not in most cases]. Now, assuming that addon did not do something wrong, is it a known issue some events to not reach an addon at all? e.g. the 'entering combat' event? And if yes, is there a way to circumvent it?