SSH port setting via ENV no longer works

Hello,
we are running the GitLab CE Docker container deployed via an Ansible playbook. We provide the configuration with the environment variable GITLAB_OMNIBUS_CONFIG. This worked fine until I upgraded to 12.1.3 (11.5.3 -> 11.11.7 -> 12.1.3). Now GitLab insists on using port 22 for SSH inside the container, disregarding our configuration. Other configuration options seem to be unaffected.

The setting in question is gitlab_rails['gitlab_shell_ssh_port'] = 2222. Has there been any change to this setting recently? I didn’t see it mentioned in the release notes for the versions we skipped.

Thanks,
Matthias