Worker nodes are stuck in updating state by Machine config operator (MCO)

Issue

• Worker nodes are stuck in updating state:

oc get mcp
NAME     CONFIG                                             UPDATED   UPDATING   DEGRADED   MACHINECOUNT   READYMACHINECOUNT   UPDATEDMACHINCOUNT   DEGRADEDMACHINECOUNT   AGE
infra    rendered-infra-1dd1414bffxxxxxxxxxxxx              True      False      False      3              3                   3                    0                      261d
master   rendered-master-6ceaf97538xxxxxxxx303085           True      False      False      3              3                   3                    0                      261d
worker   rendered-worker-4618d24xxxxxxxx3e1eca7219de1ef     False     True       False      37             32                  37                   0                      261d

2021-01-20T15:59:33.927982168Z E0120 15:59:33.923167       1 operator.go:330] timed out waiting for the condition during waitForDaemonsetRollout: Daemonset machine-config-daemon is not ready. status: (desired: 43, updated: 43, ready: 42, unavailable: 1)