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This is likely due to an incorrect service loader specified somewhere.

If you are unable to fix the server loader spec, you can add a -dontwarn rule for the class to silence the error using:

-dontwarn com.google.protobuf.java_com_google_android_gmscore_sdk_target_granule__proguard_group_gtm_N1281923064GeneratedExtensionRegistryLite$Loader

A discussion of a similar situation can be found in b/279996549

Could you see which service file the class is declared in? You will need to look for the class referenced META-INF/services/<somefile>.

Alternatively you can create a compiler input dump and attach in public here or privately with zerny@google.com and/or mkroghj@google.com and we can find the service info in that.

Unexpected reference to missing service implementation class in META-INF/services/com.google.protobuf.GeneratedExtensionRegistryLoader: com.google.protobuf.java_com_google_android_gmscore_sdk_target_granule__proguard_group_gtm_N1281923064GeneratedExtensionRegistryLite$Loader.

Unexpected reference to missing service class: META-INF/services/com.google.protobuf.GeneratedExtensionRegistryLoader.

Unexpected reference to missing service class: META-INF/services/org.jetbrains.kotlin.compiler.plugin.CommandLineProcessor.

Unexpected reference to missing service class: META-INF/services/org.jetbrains.kotlin.compiler.plugin.ComponentRegistrar.

Unexpected reference to missing service class: META-INF/services/org.jetbrains.kotlin.diagnostics.rendering.DefaultErrorMessages$Extension.

Caused by: [CIRCULAR REFERENCE: com.android.tools.r8.utils.b: Missing class com.google.protobuf.java_com_google_android_gmscore_sdk_target_granule__proguard_group_gtm_N1281923064GeneratedExtensionRegistryLite$Loader (referenced from: java.util.List kotlinx.coroutines.internal.FastServiceLoader.load(java.lang.Class, java.lang.ClassLoader))]

The app doesn't work with

-dontwarn com.google.protobuf.java_com_google_android_gmscore_sdk_target_granule__proguard_group_gtm_N1281923064GeneratedExtensionRegistryLite$Loader

You will need a -dontwarn for each type that is missing.

But "missing_rules.txt" has only -dontwarn com.google.protobuf.java_com_google_android_gmscore_sdk_target_granule__proguard_group_gtm_N1281923064GeneratedExtensionRegistryLite$Loader

After adding this to pro-guard, app stops working as intended.