Obviously it’s a possibility, but in my experience, in the several jobs that I had in my life I experienced 1 or 2 source control migration in pretty much each of the places that I have been, and a grand total of ZERO issue tracker software change between all of them. It’s obviously anecdotal but pretty much everyone is migrating to git, changing issue tracker is something that you experience much less. And even if it happens a proper migration would preserve the ids, so nothing is lost if it’s done correctly.