WIP

code/modules/hydroponics/beekeeping/honeycomb.dm

@@ -20,13 +20,13 @@
 	update_icon()
 
 
-/obj/item/reagent_containers/honeycomb/update_icon()
-	cut_overlays()
+/obj/item/reagent_containers/honeycomb/update_overlays()
+	. = ..()
 	var/mutable_appearance/honey_overlay = mutable_appearance(icon, "honey")
 	if(honey_color)
 		honey_overlay.icon_state = "greyscale_honey"
 		honey_overlay.color = honey_color
-	add_overlay(honey_overlay)
+	. += honey_overlay
 
 
 /obj/item/reagent_containers/honeycomb/proc/set_reagent(reagent)

code/modules/hydroponics/biogenerator.dm

@@ -61,7 +61,7 @@
 /obj/machinery/biogenerator/on_reagent_change(changetype)			//When the reagents change, change the icon as well.
 	update_icon()
 
-/obj/machinery/biogenerator/update_icon()
+/obj/machinery/biogenerator/update_icon_state()
 	if(panel_open)
 		icon_state = "biogen-empty-o"
 	else if(!src.beaker)

code/modules/hydroponics/fermenting_barrel.dm

@@ -64,7 +64,7 @@
 		to_chat(user, "<span class='notice'>You close [src], letting you draw from its tap.</span>")
 	update_icon()
 
-/obj/structure/fermenting_barrel/update_icon()
+/obj/structure/fermenting_barrel/update_icon_state()
 	if(open)
 		icon_state = "barrel_open"
 	else

code/modules/hydroponics/gene_modder.dm

@@ -53,17 +53,18 @@
 			min_wchance = 0
 			min_wrate = 0
 
-/obj/machinery/plantgenes/update_icon()
-	..()
-	cut_overlays()
+/obj/machinery/plantgenes/update_icon_state()
 	if((stat & (BROKEN|NOPOWER)))
 		icon_state = "dnamod-off"
 	else
 		icon_state = "dnamod"
+
+/obj/machinery/plantgenes/update_overlays()
+	. = ..()
 	if(seed)
-		add_overlay("dnamod-dna")
+		. += "dnamod-dna"
 	if(panel_open)
-		add_overlay("dnamod-open")
+		. += "dnamod-open"
 
 /obj/machinery/plantgenes/attackby(obj/item/I, mob/user, params)
 	if(default_deconstruction_screwdriver(user, "dnamod", "dnamod", I))