Slime glob (Block) are affect by gravity .Breaking the slime cave biome

[Psider]

Slime glob (the block that the slime cave biome is mostly made of) act like gravel, this cause most of the biome to collapse once one block is taken and can lead to the player being stuck in them for a while. This also destroy all the glowing slimes that drop slime blob(crafting material) and slime chests so it is probably not intended.

[pusswhackah!]

Sadly,it is.Because some monster barf it out,it has to act like gravel to try to suffocate you or immobilize you.