Ark HM currently seems to be using Innin when Selh'teus is present in the party.

Given the following trusts:

ArkHM, Selhteus, Ulmia, Yoran-Oran (UC)

And myself on RDM/NIN. Previously ArkHM's behavior would cause him to use Yonin and Provoke. Now, he uses Innin and does not change forms and does not Provoke at all, regardless of what is happening.

I think the issue may be that Selh'teus is considered a PLD in the game and while before, ArkHM's behavior was smart enough not to consider him a tank, something has changed and now he is not registering that Selh'teus is not really a tank trust.