Both versions have the bug. It'll be fixed in the next release, but if you really really really want to fight that one particular gravemarker:
This file should be placed in
Games\AdventureMode\Maps\Chapter 1\Trannadar Reserve\TrannadarReserveA\
(overwrite the existing file)
That should fix the bug and let you fight that gravemarker. There are lots of other bugfixes on the way but this patch may tide you over.