Skulk blocks do not drop when mined

Skulk blocks do not drop when mined with any tool. I tried with iron pickaxe and diamond pickaxe (Not silk touch). I wasnt having this issue when the deep dark update first came out but after mining and collecting 16 skulk blocks it doesnt drop any more no matter where I mine them from. Teleported to another ancient city (so i have checked 2 so far) and can't collect the skulk blocks.