[org.thoughtcrime.securesms] Push notifications, priority is changed to PRIORITY_UNKNOWN

Affected app
Name: [Signal]
Package id: [org.thoughtcrime.securesms]

Describe the bug
Push notification priority is changed to PRIORITY_UNKNOWN.
During the discussion regarding a push notification issue https://github.com/signalapp/Signal-Android/issues/12325 for Signal (which has been fixed) a Signal developer noted that their push notification priority https://github.com/signalapp/Signal-Android/issues/12325#issuecomment-1175191259 is changed from high-priority to PRIORITY_UNKNOWN. Also a developer of ShiftOS stated that with the ShiftOS-L flavor there are no GMS available and they are not changing any priority https://github.com/signalapp/Signal-Android/issues/12325#issuecomment-1176118333 the question arose if this might be an issue with microG.

I noticed that there was this issue https://github.com/microg/GmsCore/issues/338 requesting to put the app into a temporary whitelist when a high-priority push message is retrieved which might be related. However the pull request https://github.com/microg/GmsCore/pull/732 for the implementation was already resolved long ago in commit https://github.com/microg/GmsCore/commit/60023887d101a272f01425bf7f130576960acd50.

Would be great if you could share any insight regarding this behaviour.

System
Android Version: [10]
Custom ROM: [ShiftOS-L 3.7 (20220511)]

microG
microG Core version: [v0.2.24.214816]
microG Self-Check results: [All ticked]

Start with the linked Signal issue #12325 and its referenced comments, then review microG issue #338, pull request #732, and commit 60023887d101a272f01425bf7f130576960acd50. Reproduce the priority behavior on the stated Android and microG versions if possible; done means identifying whether microG changes the priority and documenting the cause or a concrete next step.