I created a PCUI for 3.11.0. I can view my 3.11.0 and prior clusters. I cannot view my pcluster 3.11.1 clusters.
I fire up the 3.11.0 PCUI and I click on my 3.11.1 cluster. The error message in the red bar the top complains:

It seems that 3.11.0->3.11.1 would be a minor version change, not a major version, so I believe the error message is in error.
It would be nice if minor versions could be managed by the major version PCUI?
Reproduce by:
Create a 3.11.0 and 3.11.1 cluster. Create PCUI for 3.11.0. Fire it up. It will show both clusters. Click on the 3.11.1 cluster and watch the (misleading) error message appear.