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Of course, there is incompatibility between the Warlords and HD Mod. But this is not due to the lack of development of Warlords, but rather because the HD Mod is being developed specifically for SoD and HotA.
Graying and doubling are fixed within 30 seconds in the old version of the HD Mod. On the CIS server, I will fix this quickly and easily if necessary. Other bugs, unfortunately, are not fixable, but they also do not have a significant impact on the outcome of battles (unlike, for example, the morale of neutral creatures and the inability to rebuild garrisons).
The only thing that, I think, affects the game is the difference in terrain types for players in certain battles. However, in a billion games of Warlords with the HD Mod, I have never encountered this, so I cannot say anything about "fixing" it, etc.
P.S. I advise everyone to read the following post by Mee: http://heroeswt.net/forum//topic/745/