fixes on_mob eyes overlays not updating properly sometimes.

code/modules/antagonists/cult/cult.dm

@@ -128,7 +128,8 @@
 	current.clear_alert("bloodsense")
 	if(ishuman(current))
 		var/mob/living/carbon/human/H = current
-		H.eye_color = initial(H.eye_color)
+		var/obj/item/organ/eyes/eyes = H.getorganslot(ORGAN_SLOT_EYES)
+		H.eye_color = eyes?.eye_color || initial(H.eye_color)
 		H.dna.update_ui_block(DNA_EYE_COLOR_BLOCK)
 		REMOVE_TRAIT(H, TRAIT_CULT_EYES, "valid_cultist")
 		H.update_body()

code/modules/mob/living/carbon/human/species.dm

@@ -252,7 +252,7 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 			QDEL_NULL(eyes)
 		if(should_have_eyes && !eyes)
 			eyes = new mutanteyes
-			eyes.Insert(C)
+			eyes.Insert(C, TRUE)
 
 		if(ears && (replace_current || !should_have_ears))
 			ears.Remove(C,1)

code/modules/surgery/organs/eyes.dm

@@ -31,17 +31,20 @@
 	var/damaged	= FALSE	//damaged indicates that our eyes are undergoing some level of negative effect
 
 /obj/item/organ/eyes/Insert(mob/living/carbon/M, special = FALSE, drop_if_replaced = FALSE)
-	..()
+	. = ..()
+	if(!.)
+		return
 	if(damage == initial(damage))
 		clear_eye_trauma()
 	if(ishuman(owner))
-		var/mob/living/carbon/human/HMN = owner
+		var/mob/living/carbon/human/H = owner
-		old_eye_color = HMN.eye_color
+		old_eye_color = H.eye_color
 		if(eye_color)
-			HMN.eye_color = eye_color
+			H.eye_color = eye_color
-			HMN.regenerate_icons()
 		else
-			eye_color = HMN.eye_color
+			eye_color = H.eye_color
+		if(!special)
+			H.dna.species.handle_body() //regenerate eyeballs overlays.
 		if(HAS_TRAIT(HMN, TRAIT_NIGHT_VISION) && !lighting_alpha)
 			lighting_alpha = LIGHTING_PLANE_ALPHA_NV_TRAIT
 			see_in_dark = 8
@@ -51,13 +54,15 @@
 
 /obj/item/organ/eyes/Remove(mob/living/carbon/M, special = 0)
 	clear_eye_trauma()
-	..()
+	. = ..()
 	if(ishuman(M) && eye_color)
-		var/mob/living/carbon/human/HMN = M
+		var/mob/living/carbon/human/H = M
-		HMN.eye_color = old_eye_color
+		H.eye_color = old_eye_color
-		HMN.regenerate_icons()
+		if(!special)
-	M.update_tint()
+			H.dna.species.handle_body()
-	M.update_sight()
+	if(!special)
+		M.update_tint()
+		M.update_sight()
 
 /obj/item/organ/eyes/on_life()
 	..()