See https://protobuf.dev/best-practices/dos-donts/

Don’t Re-use a Tag Number
Never re-use a tag number. It messes up deserialization. Even if you think no one is using the field, don’t re-use a tag number. If the change was live ever, there could be serialized versions of your proto in a log somewhere. Or there could be old code in another server that will break.

To guarantee both backward and forward compatibility, the field's tag number should be fixed (specified explicitly), to avoid frequent changes (due to column additions/deletions) if auto generated by tableau protogen.