In OpenShift 4.13-4.15, when a "rendered" MachineConfig in use is deleted, it's automatically recreated. In OpenShift 4.16, it's not recreated, and nodes and MCP becomes degraded due to the "rendered" not found error.

4.16

Always

1. Create a MC to deploy any file in the worker MCP

2. Get the name of the new rendered MC, like for example "rendered-worker-bf829671270609af06e077311a39363e"

3. When the first node starts updating, delete the new rendered MC

    oc delete mc rendered-worker-bf829671270609af06e077311a39363e     

Node degraded with "rendered" not found error

In OCP 4.13 to 4.15, the "rendered" MC is automatically re-created, and the node continues updating to the MC content without issues. It should be the same in 4.16.

The same behavior in 4.12 and older than now in 4.16. In 4.13-4.15, the "rendered" is re-created and no issues with the nodes/MCPs are shown.