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What exactly is the protocol on top of TLS? Is it a custom protocol that contains Protobuf, is it Protobuf directly, or is it something else (e.g., gRPC on top of TLS which contains Protobuf)? The way you worded the question is confusing.
If it's a custom protocol, then you have to add your custom protocol to the table for TLS; it doesn't list all possible protocols by default (there are thousands in Wireshark and some of them would not work at all if called from TLS) only those that are found over TLS.