Crash when returning from PlayStore purchasing interface

Hello.
Using Unity IAP in my android game I'm able to successfully launch Google Play Store's purchasing interface (where the actual transaction is handled). However, when I test the option "Credit card approves after a few minutes" or "Credit card declines after a few minutes" I get a crash when the interface closes (returning to the game).

adb logcat does not display any error messages (or any messages at all) when this happens, OnApplicationPause() and OnApplicationFocus() aren't even able to send debug messages so error presumably happens very early in the return process. This also makes it near impossible for me to debug...

Does anyone have any idea what could cause the crash?
I would be very thankful for any help.

I'm using Unity 2018.3.2f1, IAP 2.2.2

 

Sure, you mean something like this?

Selection of payment method (test options)


Interface after selection has been made


After pressing the "1-tap buy" button


The interface then slides down, the game freezes for less than a second, then crashes.