Creating Template with Import causes exception

[Chaos823]

Describe the bug

Since updating from 1.11.5 to 1.11.6 creating a new host or service template while another template is imported returns "An exception has been raised within the callback". I couldn't find anything like that in the icingaweb2 logs though.
If the Template is created without an import, then I'm able to a add the import afterwards without any errors.

Screenshots

Your Environment

• Director version (System - About): 1.11.6
• Icinga Web 2 version and modules (System - About): 2.12.6
• Icinga 2 version (icinga2 --version): r2.15.2-1
• Operating System and version: Ubuntu 24.04.4 LTS
• Webserver, PHP versions: 2.4.58-1ubuntu8.10, 8.3.6

Additional context

Going back to a snapshot with the version 1.11.5 fixes the problem. Updating to 1.11.6 again reproduces it.

[log1-c]

Can confirm this exact behaviour. Saving without the import and then adding it, works.