This was resolved in 1.4.4 update.
It wasa the same bug that makes mobs.... get stuck into the ground by a block, as spiders has only one block of height, they do not appear.
This was resolved in 1.4.4 update.
It wasa the same bug that makes mobs.... get stuck into the ground by a block, as spiders has only one block of height, they do not appear.