bbpress edit shows up twice in activity feed

HI,

When a user makes an edit to a post in a bbpress forum, the old post AND the edited post show up in the Activity Feed. I have added this patch here to my child theme: https://bbpress.trac.wordpress.org/ticket/2690 but it's still happening.

This is where I put it:
/wp-content/themes/mytheme-child/bbpress/includes/extend/buddypress/activity.php

Any ideas on why it's not working? Should I add it to the main bbpress plugin instead (and then need to remember to update it when the plugin updates?)

Thanks.