VUM Remediation Hangs at 33% Unless Host Manually Put Into Maintenance Mode

I have a 2 host 6.5 cluster edit: with Automatic DRS enabled. When I try a remediation (either both hosts or one at a time), it hangs at 33% and I manually cancel it. It's not a matter of patience e as I have left this running over night with same result. It does not evacuate the VMs at all. However, if I put a host into maintenance mode manually edit:prior to beginning remediation it evacuates as expected. Then I can remediate that host and it completes. Rinse and repeat.

Has anyone else experienced this behavior? Any ideas as to it's cause?