Verified with 4.6.0-0.nightly-2021-02-03-095533

```
$ oc get clusterversion
NAME      VERSION                             AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.6.0-0.nightly-2021-02-03-095533   True        False         19m     Cluster version is 4.6.0-0.nightly-2021-02-03-095533

$ oc -n openshift-machine-config-operator get ds/machine-config-daemon -o yaml | grep -A 4 updateStrategy 
        f:updateStrategy:
          f:rollingUpdate:
            .: {}
            f:maxUnavailable: {}
          f:type: {}
--
  updateStrategy:
    rollingUpdate:
      maxUnavailable: 10%
    type: RollingUpdate
status:
```

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Important: OpenShift Container Platform 4.6.16 security and bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:0308