Invisibility (cloak) bug

I found in White March with my solo rogue cloak, which gets +12 deflection and grants Invisibility when you are hit, or critical hit. Dont remember the name though.

I was using it only maybe two hours, but happened to me twice this:

When I was hit, Invisibility triggered, and after it ended, enemies still didn`t attack me.

This happened with undead guards before Cragholdt entrance and the same happened to me while final boss fight with Thaos.

I killed one guardian, then the second guardian gave me critical hit. Invisibility triggered. I drank two potions and started attacking the guard. He didn`t do anything, he was just waiting to die for like 15 secinds. Then I approached to Thaos, who was just standing there and also died in 15-20 seconds, without defending himself.

So either is this cloak really good, or it is bugged a lot A guess the second option is right.

Also, other thing/bug with rogue invisibility. When I pause the game and I hit Invisibility ability and lets say I decide I dont want to use invisibility, but lets say crippling strike, I am unable to cancel it.

If I select different ability for rogue to use (cripploing strike), or I cancel all his actions through button on main HUD, that bastard STILL uses invisibility as the first thing after I unpause. So I have to be always very carefull when I am selecting abilities for him in combat, otherwise I "waste" this cool ability when I dont want to.