Current activity notification disappers the moment I swipe away the app

[arinode]

Notification on the screenshot below disappears immediately after I swipe the app away (remove from recent apps).

My phone is Xiaomi Mi 9 (Android 11), every possible battery optimization is disabled. Notifications in other apps work fine, for example, Fossify Clock's stopwatch.

I am talking about this notification:

[Razeeman]

Hello! Thank you for the feedback. This is probably due to the extreme xiaomi battery optimizations. I also have a xiaomi phone and the only thing that helped is to keep the app in the memory, and pinning it so it won't be removed when clearing recent apps.