Some effects of abilities show different behaviours because of various reasons, here be some examples.
* Dragon Blood - It's bonuses are granted by Upgrades, so it isn't disabled.
* Feral Heart - It is an aura but it's effects are granted by a dummy unit, so Hexing Lycanthrope won't disable it.
* Triggered Effects - Some abilities' effects are done by triggers. These effects triggered via events like "unit has learned the ability" or boolean checks like "unit has X ability, true", so abilities like Dispersion, Counter Helix, Bristleback are not disabled, they work properly.
* Rot, Pulse Nova, Voodoo Restoration are disabled ( If you cast Hex while they are activated ) but they won't drain mana or health. Pulse Nova and Vodoo Restoration are also deactivated.