Custom option not parsed correctly when using TextFormat

[subk]

protobuf.js version: 6.4.5

Custom option are not correctly parsed when using TextFormat definition

Given this proto :

syntax = "proto3";
package test;
import "google/protobuf/descriptor.proto";

message MyOptions {
  string a = 1;
  string b = 2;
}

extend google.protobuf.FieldOptions {
  MyOptions my_options = 50000;
}

message Test {
  string value = 1 [(my_options) = { a: "foo" b: "bar" }];
}

Will result in :

{ '(my_options).a': 'foo', '(my_options).a.b': 'bar' }

Expected :

{ '(my_options).a': 'foo', '(my_options).b': 'bar' }

[subk]

As a workaround, protobuf syntax perfectly works :

message Test {
  string value = 1 [(my_options).a = "foo", (my_options).b = "bar"];
}

Result :

{ '(my_options).a': 'foo', '(my_options).b': 'bar' }