My team uses both Jira Service and Jira Software projects, although for some reason they were created on completely different sites. I recently worked with Atlassian to use their cloud migration feature to combine the two sites to leverage better automation between our service and software projects.
The problem is that after the migration, the service tickets maintained their links to the old software site. So now I have a backlog of service tickets with links pointing to the now archived external site, with a license that will expire eventually.
One fix is to manually make new links to the local version of the same ticket, although I'm hoping there is a way to solve this in bulk!