Since release 5.5.0 of the Git-Client the "security" → "Git Host Key Verification Configuration" setting is ignored (at least on Kubernetes Agents).

Workaround is manual downgrade to 5.4.1

Using anything other than "Known hosts files" causes "stderr: Host key verification failed." followed by "fatal: Could not read from remote repository."

Checking out the pipeline repos beforehand is still working, seems to be a problem on kubernetes agents builds only.