If you get the warning about your gear beeing damaged, it get´s slacked immidiatly like before the change. I lost my armor and shield that way instantly on a shifter in hive/cesspool against the slime. Same thing in abyss azzagrat against an alkalith. Lost my Shield on Slinger instantly. Others reported similar things.
This is consistent with my experience. For awhile there you'd get messages in floating text which would say your "Shield / Weapon has been damaged" and usually it happens twice, third time slag. Now it is insta-slagging. I am unsure if the progression of this is based off your total discipline though? Or if it is strictly pass / fail.