So come in here, pop in a comment and compare the comment count before you submit and after.
Edit: works properly for the first comment of the post, not for any others.
Edit Edit: Also does not increment to the proper number in this scenario: Make post, add comment (works properly), see full comments, add second comment (fails), edit post text (still shows previous number)
Edit edit edit: Don't you hate users who find niche bugs?
Test