In the MCN object, spec.configVersion.desired is being set after an update completes its update prepared phase and status.configVersion.desired is set. This is the opposite of what is intended functionality.

Observed in 4.19, 4.16, and 4.15, so presumably in all versions with MCN in tech preview (4.15+)

Always

    1. Start a 4.19 cluster with tech preview enabled.
    2. Apply a MC.
    3. Carefully watch the MCN config versions update. Example command to follow relevant fields:

oc describe machineconfignode/ip-10-0-108-23.ec2.internal | grep -E "Config Version|UpdatePrepared" -A 2

In this case, `rendered-worker-aa4a179eba20c0a02b402a34587d27a1` represents the old rendered config and `rendered-worker-25fcd6bb6fc89837a77955fcd30ce025` represents the new rendered config. The following shows how the MCN object updates during the upgrade process:

Spec:
  Config Version:
    Desired:  rendered-worker-aa4a179eba20c0a02b402a34587d27a1
…
Status:
  Conditions:
    Message:               This node has not yet entered the UpdatePrepared phase
    Reason:                NotYetOccured
    Status:                False
    Type:                  UpdatePrepared
    Last Transition Time:  2025-03-04T14:05:24Z
…
  Config Version:
    Current:            rendered-worker-aa4a179eba20c0a02b402a34587d27a1
    Desired:            rendered-worker-aa4a179eba20c0a02b402a34587d27a1

Spec:
  Config Version:
    Desired:  rendered-worker-aa4a179eba20c0a02b402a34587d27a1
…
Status:
  Conditions:
    Message:               This node has not yet entered the UpdatePrepared phase
    Reason:                NotYetOccured
    Status:                False
    Type:                  UpdatePrepared
…
  Config Version:
    Current:            rendered-worker-aa4a179eba20c0a02b402a34587d27a1
    Desired:            rendered-worker-25fcd6bb6fc89837a77955fcd30ce025

Spec:
  Config Version:
    Desired:  rendered-worker-25fcd6bb6fc89837a77955fcd30ce025
…
Status:
  Conditions:
    Message:               Update is Compatible.
    Reason:                UpdateCompatible
    Status:                True
    Type:                  UpdatePrepared
…
  Config Version:
    Current:            rendered-worker-aa4a179eba20c0a02b402a34587d27a1
    Desired:            rendered-worker-25fcd6bb6fc89837a77955fcd30ce025

The spec.configVersion.desired value should immediately be set when the node annotation is updated on the node. Later, after the update is validated, the status.configVersion.desired value should be set. These values are being set out of order.