https://reportportal-openshift.apps.dno.ocp-hub.prod.psi.redhat.com/ui/#prow/launches/1578/823195 
this prow job failed and i try to reproduce. finally i found the installation behind proxy will failed when enable TP in 4.22. the bootstrap was failed, the master machines was created but can't fetch the ignition.
The machine-config-controller has been continuously rolling back.

    4.22.0-0.nightly-2026-01-06-164201

    install cluster enable TP and proxy.

    1.install a cluster behind proxy and enable tp.
    2.
    3.
    

    installation failed.

    installation successful.    

time="2026-01-08T06:33:46Z" level=warning msg="Failed, retrying in 1s ... (1/50). Error: pinging container registry quay.io: Get \"https://quay.io/v2/\": dial tcp 52.203.142.72:443: i/o timeout"
E0108 06:34:16.850064    1 imagestream_source.go:62] error inspecting ImageStream Image for OSImageStream generation. quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:53f09f0ee42099faddae15e2a3364f6467396c55f34660e6cb8492e6a9b9f3ae image will is ignored. context deadline exceeded
E0108 06:34:16.850074    1 imagestream_source.go:62] error inspecting ImageStream Image for OSImageStream generation. quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:cec23b7e42ea89169a7f5c0f42bcc78cfb64d7297833ea989db33d9ead97e322 image will is ignored. error getting image source for quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:cec23b7e42ea89169a7f5c0f42bcc78cfb64d7297833ea989db33d9ead97e322: error getting image source for //quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:cec23b7e42ea89169a7f5c0f42bcc78cfb64d7297833ea989db33d9ead97e322: pinging container registry quay.io: Get "https://quay.io/v2/": context deadline exceeded 
F0108 06:34:16.850456    1 bootstrap.go:47] error running MCC[BOOTSTRAP]: error inspecting available OSImageStreams: unable to retrieve any OSImageStream from the configured sources