That's probably why, not sure if this plugin was updated to support 0.6.0. Also I'm not sure it was ever designed to parse bbcode on the fly like that. But I could be wrong.
Plugin updated to support NodeBB v0.9.x
Topics and posts created by new users are now hidden from other users until the user is approved by an admin. They will be visible for the users themselves and admins. (Idea suggested here gh#3552)
Admins can either approve the user or delete them from the plugin's ACP page.
Clicking on the username will take you to the users profile page where you can review the posts made by the user.
Please report any issues on the plugins github page https://github.com/pichalite/nodebb-plugin-newuser-approval
I was wondering what you were up to when you asked for the hook that occurred on post filtering.
plugin updated for NodeBB v1.x.x