If you cast Pact of the Wolf and turn off the illusion, and then get on a mount. If you zone, you'll be dismounted and turned back into a werewolf. You used to be able to zone on a mount with Pact of the Wolf up.
Then do what everyone else is, block the illusion. The other has not been true, since it was changed to aura.
Was happening to me too last night. I couldn't figure out why I was dismounting but it is definitely Pact of the Wolf.