Blank permission request dialog shown (GmsGcmRegister java.lang.RuntimeException: Push permission not granted to app)

Since upgrading UnifiedNlp yesterday I've gotten a few weird permission popups:

Looking at Logcat they seem to be associated with this error:

java.lang.RuntimeException: Push permission not granted to app
	at org.microg.gms.gcm.PushRegisterServiceKt.ensureAppRegistrationAllowed(PushRegisterService.kt:73)
	at org.microg.gms.gcm.PushRegisterServiceKt$ensureAppRegistrationAllowed$1.invokeSuspend(Unknown Source:10)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
	at androidx.lifecycle.DispatchQueue.drainQueue(DispatchQueue.kt:76)
	at androidx.lifecycle.DispatchQueue.enqueue(DispatchQueue.kt:106)
	at androidx.lifecycle.DispatchQueue.access$enqueue(DispatchQueue.kt:32)
	at androidx.lifecycle.DispatchQueue$runOrEnqueue$$inlined$with$lambda$1.run(DispatchQueue.kt:93)
	at android.os.Handler.handleCallback(Handler.java:873)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:193)
	at android.app.ActivityThread.main(ActivityThread.java:6718)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

I haven't found a pattern in when the popup is shown yet. If I dismiss it it seems to come back at random, sometimes within a few seconds and sometimes after some hours.

Please let me know if I can assist in debugging -- and thank you for your work on microg!

Start with org.microg.gms.gcm.PushRegisterService.kt at ensureAppRegistrationAllowed, using the supplied Logcat trace and the reported blank permission dialog as the entry points. Reproduce the intermittent popup if possible and trace the permission-request path; done means the reported blank dialog and recurring Push permission not granted error are addressed.