Spawning mobs above chasms/lava does not fire signals to cause turf effects to mob

[warriorstar-orion]

Exploit Reports

• I confirm this issue is not an exploit. (Required)

BYOND Version

515.1634

Issue Description

When using the Game Panel to spawn mobs above chasms, the mob remains floating above the chasm until it attempts to move.

What did you expect to happen?

Spawning objects should properly fire all relevant signals regardless of whether created by admins or in-game.

What happened instead?

The spawned mob floats despite not having the ability to.

Why is this bad/What are the consequences?

Indicates we're not properly handling signals somewhere.

Steps to reproduce the issue.

Observe a round in test_tiny. Create a 3x3 area of turfs of type /turf/simulated/floor/chasm/straight_down/lava_land_surface with the game panel. Spawn a mob in the center of the 3x3 area. Observe the mob doesn't fall. Take control of the mob. Move the mob in any direction and observe that it falls.

When did the problem start happening?

Probably eons ago.

Extra information

No response

Relevant log output/runtime error