How to remove a custom job ("CustomJob*") from a workflow in a custom template?

[OleWunschmann]

We have a customized template for COSMO Alpaca:
https://github.com/cosmoconsult/Alpaca-PTE
We rely on the features for custom templates introduces with the pull request #853

We added some customizations in the form of "CustomJob-..." to some workflows (e.g. CICD.yaml)
But now we can not remove these custom jobs or rather the removal is not passed correctly to repositories using this template.

If I understand the custom template feature correctly, a template is encouraged to use custom jobs so that updating the template - with workflow "Update AL-Go System Files" - retains those jobs.
But this results in the mentionend problem for the final repository because removed custom jobs are re-added as custom jobs from the final repository.

Repro:

• Custom template using custom jobs
• Repository using the template
• Removing a custom job from the template
• Updating repository using the template
• Repository still contains the removed custom job

A similar problem occurs on renaming a custom job:
The "new" custom job is added but the "old" custom job is also retained in the final repository.

Is there a solution to this problem without having to manually remove the custom jobs from each repository?