I've extended helpdesk module and on _message_post_after_hook() depending on some custom flow I'm updating some ticket values (like stage for example)

The update is done accordingly, I even see the automatic notification in the chatter that the stage has been updated, but ticket stage it's not reflecting the stage (until I manually refresh page or do another update of that ticket)

I've tried to return True, {'values': {'stage_id': new_stage_id}} and also 'ir.actions.client' with reload tag but they're not included in the response to the client (only default message_post info)

How can I update UI from this hook ?