When you try to comment too long message, GitHub API will return error, and nothing is commented to PR.
POST https://api.github.com/repos/<owner>/<repo>/issues/<pr number>/comments: 422 Validation Failed [{Resource:IssueComment Field:data Code:unprocessable Message:Body is too long (maximum is 65536 characters)}]
WHAT
I shorten too long results commented to GitHub.
WHY
When you try to comment too long message, GitHub API will return error, and nothing is commented to PR.