> AFAIK ignoring unknown fields is a MUST in the protobuf spec. Yes, but there isn't only an unknown field, but also a missing field. (The old field index) Thu

> AFAIK ignoring unknown fields is a MUST in the protobuf spec. Yes, but there isn't only an unknown field, but also a missing field. (The old field index) Thus it doesn't meet the requirements of the client. Now that probably could be circumvented by doing more edits to the protobuf message. If nothing else works by injecting 0s length ads instead.