Attempting to spawn on death fails with 8 enemies

Possible bug:
I have an enemy that spawns another enemy on death when there's already 8 enemies on the screen. My assumption was that the new enemy would spawn on top of the dying one, but this is not the case:
The new enemy does not spawn at all.

I searched bugzilla and didn't find anything similar, so I've already sent it in.

The temporary solution, of course, is to always leave at least one enemy slot open for spawning. This is a bit of an issue for me because I'm setting up a 4-on-4 melee between these enemies, and some of them are supposed to do special things on death, like activating tags.

This is the intended behavior. Spawning always fills the first available slot *before* removing the dying enemy.

I do want to make an option to changed that, so you can make spawning use the dying enemy's slot. That is what people use spawning for most often.