I've seen inconsistent results with Stealth recharge while Lurker's Assault is active. When stealth depletes while LA is active it does remove you from stealth in my experience. I can't verify visually (due to LA visuals), but the stealth buff goes away under my picture. I didn't notice this problem (stealth not recharging…
As grave news is imparted by a battle-hardened Neverwinter guard, this band of adventurers steel themselves for less pleasant scenery -- surely to be filled with less butterflies.