Zendesk external_id set in any_channel push not present in trigger

Hi,

We create tickets/follow-up messages with /api/v2/any_channel/push and it works great - follow-up messages end up in the same thread, channelback contains the external_id, etc.

Unfortunately, when we trigger a target with content "{{ticket.external_id}},{{ticket.status}}", the message comes through as ",Open", for example, with the external_id empty despite it existing in every other context.

Are we doing something wrong? :)