Undying Alchemist in Warehouse Sewers

Hey, I run a summoner build and usually grab a few Undying Alchemists as spectres from the warehouse sewers using Desecrate. Today I couldn't spawn any after about twenty minutes of trying, even after loading multiple instances. I couldn't find the patch notes which would explain if Desecrate has been changed, the mob has been taken out of that map, or if the mob has been taken out of the game in general. I'd appreciate if someone could point me in the right direction.

This is most likely due to invasion mobs replacing the mob you're looking for. You'll need to make new instances till you find them. Experienced this 'nuisance' before when I was trying to get those snakes in Warehouse and had to remake about 20 times.