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The v2 proto file uses
proto2syntax (line 1), which requires every field to have an explicit label (optional,required, orrepeated). All other messages in this file consistently useoptionalfor scalar fields (e.g.,FaceExtraat line 597,QFaceExtraat lines 607–616). The three fields here are missing theoptionallabel, which makes them invalid proto2 and inconsistent with the rest of the file.It looks like these fields were copied verbatim from
proto/message/v1/element.proto(which usesproto3syntax where labels are implicit). Please addoptionalto all three fields to match the v2 file conventions.