BuddyPress.org

I suppose this is a long shot, but here goes.

So I have BuddyPress and the Vantage theme installed on this random website (On a development server that’s only for internal users so no link available). On any of the BuddyPress Groups pages on this site, I get the following warning:

( ! ) Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘bp_group_new_topic_button’ not found or invalid function name in /var/www/html/INSTALLFOLDER/wp-includes/class-wp-hook.php on line 287

Googling hasn’t really provided me with any solutions, so perhaps someone here may know the answer.

-Tried testing with TwentyTwenty theme and still get the warning.
-Tried changing Template Packs from Legacy to Nouveau and vice versa.
-Tried adding some code into functions.php to no avail.
-I disabled the bp-template-pack, but while that fixes the warning, it affects the Vantage theme design.

Using WordPress 5.5.3, BuddyPress 6.4.0, Vantage theme 1.15.5 as well as the bp-template-pack at version 1.2.1

Thanks!