Ticket #8579: 8579.patch

src/bp-activity/bp-activity-functions.php

@@ -2303 +2303 @@
         // Update the activity entry.
         $activity = new BP_Activity_Activity( $activity_id );
 
+        // Check if the Post author has changed.
+        if ( (int) $post->post_author !== (int) $activity->user_id ) {
+                $activity->user_id = (int) $post->post_author;
+        }
+
         if ( ! empty( $post->post_content ) ) {
                 $activity_summary = bp_activity_create_summary( $post->post_content, (array) $activity );