Slime spawning ignores height available

Large slimes spawn in slime chunks in areas that are 2.0 blocks tall, and even in area that are 1.8125 blocks tall (2 block space -  trapdoor on the underside of the ceiling block). The large slimes also do not suffocate when they spawn.

Noticed when building a hostile mob system on my bedrock realm. Screenshot of one stuck jumping in place.

Tested on offline worlds, the realm, Xbox one and Android - all running 1.14.1.