microg companion crashes with unexpected field encoding

Describe the bug
Unfortunately I don't know how to reproduce it. All I know is that MicroG companion crashed with the following stack trace.

System
Android Version: 15
Custom ROM: CalyxOS 6.2.3

Additional context

FATAL EXCEPTION: main
Process: com.android.vending, PID: 20222
java.net.ProtocolException: Unexpected field encoding: 6
	at com.squareup.wire.ProtoReader.skipGroup(SourceFile:58)
	at com.squareup.wire.ProtoReader.nextTag(SourceFile:84)
	at com.google.android.finsky.ExpressFilePB$Companion$ADAPTER$1.decode(SourceFile:15)
	at com.squareup.wire.ProtoAdapter.decode(SourceFile:1)
	at com.google.android.finsky.IntegrityExtensionsKt$updateExpressSessionTime$2.invokeSuspend(SourceFile:42)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(Unknown Source:8)
	at kotlinx.coroutines.DispatchedTask.run(Unknown Source:96)
	at androidx.fragment.app.Fragment$4.run(SourceFile:13)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Unknown Source:2)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(SourceFile:92)
	Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@6fa3a94, Dispatchers.Main.immediate]

Start with the stack trace around com.squareup.wire.ProtoReader.skipGroup and nextTag, then trace ExpressFilePB and IntegrityExtensionsKt.updateExpressSessionTime. The report provides no reproduction steps, so first determine what produces field encoding 6 on Android 15 and establish a way to validate that the crash no longer occurs.