Ahhh, I already tested it so... Verified 5.8.1.2. According to steps to reproduce I can do these steps as many times I want and "All Instances" & "All Datastores" in accordion are working.
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, 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-2017:1758