[BUG] Gmail Invalid thread_id

[andrewjschuang]

Describe the bug
Gmail Send Email - there's a bug preventing replies via a thread_id. See this post.

[vunguyenhung]

Hi everyone, all test cases are passed! Ready for release!

Test report
https://vunguyenhung.notion.site/BUG-Gmail-Invalid-thread_id-175bf548bb5e81eda0ecdde9969f1c81