OpenShift 4 upgrade stuck due to a malformed header in a custom machine config

Solution In Progress - Updated -

Issue

The machine-config-operator (MCO) is in a degraded state due to rendered degraded error due to malformed headers

 lastTransitionTime: '2022-12-12T10:32:16Z'
    message: 'Failed to render configuration for pool worker: rpc error: code = Unknown
      desc = malformed header: missing HTTP content-type
    reason: ''
    status: 'True'
    type: RenderDegraded

Environment

  • Red Hat OpenShift Container Platform (RHOCP)
    • 4

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