xApp Events on Android

I am currently testing a new xApp – Xumm Sdk v1.7.6 and Xaman App v2.6.
Opening a sign request works on both iOS and Android.
If I close it (sign or decline) iOS receives the event, Android does not.
The event handler is registered on both but only iOS receives the event.
When I manually check the payload status, it shows that it is updating properly on both operating systems.
Have you ever had something like this? Or do you have an idea what it could be?