Ok i found the issue.
In the past (one year or more ago) I was always able to deploy ubuntu 18.04, 20.04, 22.04 with the following kernel parameter set intel_iommu=on iommu=pt (needed for some gpu PT) and as such I never thought this would be an issue.
Now I tried to remove those kernel options for MaaS and it seems for some reason (maybe due to newer kernels being used on the ubuntu images nowadays) that was the culprit.
In short if I have the kernel parameter intel_iommu=on iommu=pt set I can only deploy the Ubuntu 20.04 LTS image. If I remove those parameters I can additionally deploy with no issues Ubuntu 22.04.
The question remains why it stopped working now but I can work with just the 20.04 release for now.
Thanks for the help.
BR