Rek'Sai BUGFIX?/BUFF

"Fixed a bug where R - Umbral Trespass wasn’t making Kayn ‘unseen’ for Duskblade of Draktharr’s Nightstalker proc"

doesn't this mean that should get a duskblade reset when she ults too then? because Rek'sai disappears for 1.5 seconds during her ult. Unless for some reason Rek'Sai being underground is not the same as stealth or being out of vision?