Fix #4078 (#4081)

code/modules/mob/mob_helpers.dm

@@ -1033,6 +1033,10 @@ proc/is_blind(A)
 	. = ..()
 	. |= TYPE_SYNTHETIC
 
+/mob/living/silicon/find_type()
+	. = ..()
+	. |= TYPE_SYNTHETIC
+
 // Yeah, I'm just going to cheat and do istype(src) checks here.
 // It's not worth adding a proc for every single one of these types.
 /mob/living/simple_animal/find_type()

html/changelogs/lohikar-whoops.yml

@@ -0,0 +1,4 @@
+author: Lohikar
+delete-after: True
+changes: 
+  - bugfix: "Unathi can no longer chew through metal."