[@robin-w Moderator 6 years, 5 months ago]

nor have I.

The function is called by core/filters.php

Line 203: add_filter( 'bbp_get_form_forum_content', 'bbp_code_trick_reverse' );
Line 206: add_filter( 'bbp_get_form_topic_content', 'bbp_code_trick_reverse' );
Line 209: add_filter( 'bbp_get_form_reply_content', 'bbp_code_trick_reverse' );

so you could try

remove_filter ('bbp_get_form_forum_content', 'bbp_code_trick_reverse' );

etc.
in your child theme and see what removing it does