Fixes #8702 properly.

code/modules/organs/organ.dm

@@ -235,6 +235,7 @@ var/list/organ_cache = list()
 
 	owner.internal_organs_by_name[organ_tag] = null
 	owner.internal_organs_by_name -= organ_tag
+	owner.internal_organs_by_name -= null
 	owner.internal_organs -= src
 
 	var/obj/item/organ/external/affected = owner.get_organ(parent_organ)

code/modules/organs/organ_external.dm

@@ -1056,6 +1056,7 @@ Note that amputating the affected organ does in fact remove the infection from t
 
 /obj/item/organ/external/head/removed()
 	if(owner)
+		name = "[owner.real_name]'s head"
 		owner.u_equip(owner.glasses)
 		owner.u_equip(owner.head)
 		owner.u_equip(owner.l_ear)

code/modules/organs/organ_icon.dm

@@ -16,6 +16,8 @@ var/global/list/limb_icon_cache = list()
 /obj/item/organ/external/proc/sync_colour_to_human(var/mob/living/carbon/human/human)
 	s_tone = null
 	s_col = null
+	if(status & ORGAN_ROBOT)
+		return
 	if(!isnull(human.s_tone) && (human.species.flags & HAS_SKIN_TONE))
 		s_tone = human.s_tone
 	if(human.species.flags & HAS_SKIN_COLOR)