How to identify a ticket merge through Webhooks?

How to identify a ticket merge through Webhooks?

The ticket merge functionality moves all Threads and Comments from one Ticket to another. I want to identify this action to correctly apply these changes on my application end.

Currently, my application only receives a Ticket_Update notification for the Ticket that has been removed (isTrashed is true), but there is no way to identify how to apply the changes related to the Threads and Comments on my application.

What is the advised way to do so?

Thanks.