I don't know exactly where the bug lies, I think it is on the Play Store but I guess it could be Google Play Services.
Basically a user with accounts X and Y on their phone will make an in-app purchase on my app with account X. Then I will do a staged rollout of an update and that user who had the app installed as account X all of the sudden will get the update for account Y and the app will not recognize the in-app item as purchased.
I have talked with another developer with a similar in-app model and they experience the same bug.
Where do I submit that bug?