Ticket #8296: 8296.patch

src/bp-activity/bp-activity-cache.php

@@ -47 +47 @@
 function bp_activity_clear_cache_for_activity( $activity ) {
         wp_cache_delete( $activity->id, 'bp_activity' );
         wp_cache_delete( 'bp_activity_sitewide_front', 'bp' );
+
+        if ( 'activity_comment' == $activity->type && $activity->is_spam ) {
+                wp_cache_delete( $activity->item_id, 'bp_activity_comments' );
+        }
 }
 add_action( 'bp_activity_after_save', 'bp_activity_clear_cache_for_activity' );