I've installed the beta release 5.4 20100621 but no progress on this issue. In addition known issue list this that seems different (or bad description) of the issue mentioned in this trail.
So I'm afraid this will not be fixed in the 5.4 release
The knows issue is:
"High Availability: Errors with migration of Hyper-V virtual machine on HA node StarWind service restart during initiated vm migration process. "