GCP: no redirect of domain to ip
Solution 1:
I have solved my issue after contacting gcp support - GCP has two options for redirecting Domain to an ip. You can create an DNS Zone, or you can just put an A Record in google domains in the DNS Settings - but only the Domain DNS Setting OR the DNS Zone applies.
In GCP Domain -> Network services -> cloud domains click on your domain and "edit DNS Details".
There you can configure either the zone, that is applied for your domain, or the google domain settings.