We noticed in our build01, master pool was degraded on Apr 12.
We also have https://prow.ci.openshift.org/?job=periodic-build01-upgrade , which periodically execute cluster upgrade (oc adm upgrade --to-latest).
We find build01 started upgrading to 4.13.0-rc3 on Apr 13.

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[fedora@Bear-Work-RedHat ~]$ oc --context build01 describe mcp master
...omitted...
The master pool reports:
Status:
  Conditions:
    Last Transition Time:  2021-03-11T20:49:24Z
    Message:
    Reason:
    Status:                False
    Type:                  RenderDegraded
    Last Transition Time:  2023-04-12T13:28:44Z
    Message:
    Reason:
    Status:                False
    Type:                  Updated
    Last Transition Time:  2023-04-12T13:29:17Z
    Message:               Node ip-10-0-140-81.ec2.internal is reporting: "exit status 1"
    Reason:                1 nodes are reporting degraded status on sync
    Status:                True
    Type:                  NodeDegraded
    Last Transition Time:  2023-04-12T13:29:17Z
    Message:
    Reason:
    Status:                True
    Type:                  Degraded
    Last Transition Time:  2023-04-12T13:28:44Z
    Message:               All nodes are updating to rendered-master-26f9e3d3ea47eadf53d3b00e9c447fa5
    Reason:
    Status:                True
    Type:                  Updating
...omitted...