While committing a batch to firestore, if a documents breaks one of the security rules, we only receive: Status{code=PERMISSION_DENIED, description=Missing or insufficient permissions., cause=null}
That doesn't tell me which document in the batch has the issue. Can you add the document path the is causing the error? Potentially in the "cause" field?

The logic behind this is that we are seeing Crashlytics reports on our android project with these PERMISSION_DENIED errors, and it is near impossible to track it down without more data.