Old transactions disappear from receipt in sandbox

Hello,


We noticed, that old non-consumable purchase can dissappear from application receipt for test user in sandbox (we test it by sending receipt to Apple). It's really strange, because when we try to purchase it again, system says "You've already purchased this. Would you like to get it again for free?". Refreshing receipt doesn't help.


I tend to think, that this is some kind of Sandbox bug. Of course there's a chance, that we missed something along the way, but I can't think of any possible action on our side, that could have caused this problem.


If someone else faced same issue or have some piece of advice, please do let us know in this thread.


Thank you!