I vant to fix your bugs

grabs the rest of the port + merges some behavior

code/__byond_version_compat.dm

@@ -16,8 +16,8 @@
 #endif
 
 #if (DM_VERSION == 514 && DM_BUILD == 1589)
-#error Warning! Byond 514.1589 has been known to be unstable. Use at your own risk.
-#error Please consider using 514.1588.
+//#error Warning! Byond 514.1589 has been known to be unstable. Use at your own risk.
+//#error Please consider using 514.1588.
 #endif
 
 // Keep savefile compatibilty at minimum supported level

code/datums/components/forensics.dm

@@ -190,4 +190,6 @@
 		return
 	if(!length(blood_DNA))
 		return
-	parent.AddElement(/datum/element/decal/blood, _color = get_blood_dna_color(blood_DNA))
+	if(isitem(parent))
+		var/obj/item/I = parent
+		I.AddElement(/datum/element/decal/blood, initial(I.icon) || I.icon, initial(I.icon_state) || I.icon_state, _color = get_blood_dna_color(blood_DNA))

code/datums/elements/decals/blood.dm

@@ -12,27 +12,15 @@
 	return ..()
 
 /datum/element/decal/blood/generate_appearance(_icon, _icon_state, _dir, _layer, _color, _alpha, source)
-	var/obj/item/I = source
-	if(!_icon)
-		_icon = 'icons/effects/blood.dmi'
-	if(!_icon_state)
-		_icon_state = "itemblood"
+	if(!_icon || !_icon_state)
+		return FALSE
 	if(!_color)
 		_color = COLOR_BLOOD
-	var/item_icon = I.icon
-	var/item_icon_state = I.icon_state
-	var/static/list/blood_splatter_appearances = list()
-	//try to find a pre-processed blood-splatter. otherwise, make a new one
-	var/index = "[REF(item_icon)]-[item_icon_state]"
-	pic = blood_splatter_appearances[index]
-
-	if(!pic)
-		var/icon/blood_splatter_icon = icon(I.icon, I.icon_state, null, 1)		//we only want to apply blood-splatters to the initial icon_state for each object
-		blood_splatter_icon.Blend("#fff", ICON_ADD) 			//fills the icon_state with white (except where it's transparent)
-		blood_splatter_icon.Blend(icon(_icon, _icon_state), ICON_MULTIPLY) //adds blood and the remaining white areas become transparant
-		pic = mutable_appearance(blood_splatter_icon, initial(I.icon_state))
-		pic.color = _color
-		blood_splatter_appearances[index] = pic
+	var/icon/blood_splatter_icon = icon(_icon, _icon_state, , 1)		//we only want to apply blood-splatters to the initial icon_state for each object
+	blood_splatter_icon.Blend("#fff", ICON_ADD) 			//fills the icon_state with white (except where it's transparent)
+	blood_splatter_icon.Blend(icon('icons/effects/blood.dmi', "itemblood"), ICON_MULTIPLY) //adds blood and the remaining white areas become transparant
+	pic = mutable_appearance(blood_splatter_icon)
+	pic.color = _color
 	return TRUE
 
 /datum/element/decal/blood/proc/get_examine_name(datum/source, mob/user, list/override)