BuddyPress.org

It could be that bbPress has changed the way it finds clickable links in 2.6. Here’s some code that works for me to prevent bbPress from finding these links:

add_filter(
	'bbp_make_clickable',
	function( $val ) {
		remove_filter( 'bbp_make_clickable', 'bbp_make_mentions_clickable', 8 );
		return $val;
	},
	0
);