Seems there was a change to NPCscanner where some rare elites will not sound the alarm unless you mouse over it. Ive looked at wowhead and the newest comments talk about a macro that must be spammed.
Problem is however i can never seem to pickup the blood seeker bat with this macro. Its been a few days now. Before when i tried hunting with npc scanner, it went off i saw the bat and that was it for the next 6 hours no more spawn. Now, im not sure where or when the bat was even spawned because i have no way of knowing if/when it spawned