Large Magmas/Slimes spawning in too small of spaces

The largest variants of both Magma Cubes and Slimes spawn in spaces smaller than the required amount of space, resulting in them being stuck halfway through walls, floors, and ceilings. I have seen them spawn in a 1 high space, 2 wide spaces, and so on. Can be very frustrating when the largest variant spawns in a two-tall and 1-wide tunnel, for example.