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I have updated from 2.1 to the latest 2.3.1 version, and it brokes part of a plugin I've written before.
I'm calling this function DiscussionController_BeforeCommentBody_Handler() and at the end I have filled $Discussion->Body with the HTML code I want to print in the page. But all my formatting class disappears when the page is rendered. I mean if I var_dump($Discussion->Body) the result is properly formatted on the webpage, but then the same code, after the vanilla core process, doesn't contain my tags anymore. Which messed up all the formatting because the css classes are not called.
I have read the thread about BBCode renderer, but I have never used BBCode.