Hi, thanks for that … I have resolved (or worked around) by adding some supported events to the code around line 49 of sync-discourse-topic.php …
$this->supported_events = array(
'post_created',
'post_updated',
'post_edited',
'post_destroyed',
'post_recovered',
);
Looks like as this just triggers it to re-read, that was all that was needed.