Blood oddity with custom dehacked things

[KLNeidecker]

If one makes a new "Tall lamp 2" via copying it an making a new thing via DSDEHACKED, the lamp spawns with a pool of blood around it.

If one creates a new thing via DSDEHACKED and gives it the flags of "Blood Color = 0" and "Retro Bits = DECORATION", though the wiki says this combo should spawn blood below the thing, it does not.

If one creates the lamp above, but uses a +NOBLOOD flag, it stops the blood pool.
And no combo of +NOBLOOD or -NOBLOOD or +CORPSE or anything else seems to make the dead scientist spawn the pool.

Decohack code

auto thing RandomlyBloodyLight : thing TechLamp2 "Randomly bloody light"
{
	ednum 11000
}

auto thing NotBloodyCorpse "Corpse that isn't bloody"
{
	ednum 11001
	BloodColor 0
	RetroBits "DECORATION"
	+CORPSE
	states
	{
		spawn:
			MSCI N -1
   			stop
   		
   	}
}

Dehacked result:

Patch File for DeHackEd v3.0
# Created with DECOHack v0.37.0 by Matt Tropiano
# Note: Use the pound sign ('#') to start comment lines.

Doom version = 2021
Patch format = 6

Thing 155 (Randomly bloody light)
ID # = 11000
Hit points = 1000
Width = 1048576
Height = 1048576
Reaction time = 8
Bits = 2
Mass = 100
Initial frame = 963

Thing 156 (Corpse that isn't bloody)
ID # = 11001
Bits = 1048576
Initial frame = 1156
Blood Color = 0
Retro Bits = DECORATION

And a screenshot of what this looks like in practice:

I'm not sure what is going on, but the only way I'm able to get Retro to do the good-old blood spatter under my poor dead scientist is if I spawn it with a gib frame first AND THEN loop into normal frames. The gib frame makes retro spawn the blood.

	States
	{
		//Odd spawn trick to convince Doom Retro it needs blood
		Spawn:
			PLAY W 1 // Player gib frame
			goto Main
		Main:
			MSCI N -1 // Actual dead scientist frame
			stop
		XDeath:
		        PLAY W -1
		         Stop
	}

[bradharding]

I disabled the "more blood" effect enabled using r_corpses_moreblood CVAR for any thing with a custom sprite, as more often than not, they're not corpses. So, I've just implemented "Retro Bits = MOREBLOOD".

[KLNeidecker]

Very cool. I've made a ton of progress on the map using only Retro for the design (and testing in Woof, GZDoom, and others to catch the inevitable edge-cases), and it may have ruined me for other ports at this point. There's more grit in Retro than other ports, more of the feel I got in the 90s when first seeing Doom on my Jaguar.

Great work.

The Retro bit is an excellent fix. Any idea why the light post randomly bleeds? Is that related? I mean, a simple noblood flag fixes it, which frankly should be set on any custom things meant for decoration anyway just to cover all the bases in the case of players using mods with your custom dehacked thing, or to future proof it from bleeding by mistake under some odd circumstance, but I wonder what caused it. I really should try a few sprites and see if that lamp sprite is the culprit, and if I used a column or another decoration... maybe some code looking to put blood under the correct sprite is getting tricked by the lamp sprite name.