Less of a bug, more of a suggestion. I was reaching the maximum turn time, played Roxanne with 2 etb doublers, and 3 token doublers on the field. When the timer expired, the targets for the effect "on etb, deal 2 damage" were defaulted to my own face. I'm GUESSING that this is because you don't separate default targets by effect type, and you just have a default list that just selects first valid target, akin to self, opponent, own static zones, opponent's static zones, permanents by timestamp, etc.

Would it be possible to change the default target list by effect type? Or does the code not even look at effect type until the target has been chosen