Install of PowerScale fails: docker changes break cluster

Performing the step from the install doc for docker setup:

[Service]
...
MountFlags=shared

And restarting docker causes our cluster to fail. Running k8s v1.20.6. After adding that line to the docker config and restarting causes the K8 docker processes to no longer startup. After digging I found this, where it looks like they recommend not adding that to the docker config at all.

https://docs.docker.com/engine/release-notes/18.09/#18091

Running docker-ce-20.10.6-3 on RHEL 8.4.

Once I removed all the MountFlags=shared entries and restarted docker, everything is fine again.

Is this flag required, or will PowerScale work without it now?