Repeated fields in a nested meesage fails when `no-cow` option is enabled + proto3. Succeeds with proto2

[mgild]

message RoundResult { optional int32 num_success = 1; optional int32 num_error = 2; optional double mean = 3; optional uint64 round_open_slot = 4; optional int64 round_open_timestamp = 5; optional double min_response = 6; optional double max_response = 7; repeated float current_round_responses = 8; repeated float last_round_responses = 9; } message State { optional RoundResult result; }