fix

code/game/objects/items/devices/portable_chem_mixer.dm

@@ -113,8 +113,7 @@
 	if (loc != user)
 		return ..()
 	if(SEND_SIGNAL(src, COMSIG_IS_STORAGE_LOCKED))
-		ui_interact(user)
-		return
+		INVOKE_ASYNC(src, /datum.proc/ui_interact, user)
 
 /obj/item/storage/portable_chem_mixer/attack_self(mob/user)
 	if(loc == user)

code/game/objects/obj_defense.dm

@@ -204,9 +204,6 @@ GLOBAL_DATUM_INIT(acid_overlay, /mutable_appearance, mutable_appearance('icons/e
 /obj/proc/acid_processing()
 	. = 1
 	if(!(resistance_flags & ACID_PROOF))
-		for(var/armour_value in armor)
-			if(armour_value != "acid" && armour_value != "fire")
-				armor = armor.modifyAllRatings(0 - round(sqrt(acid_level)*0.1))
 		if(prob(33))
 			playsound(loc, 'sound/items/welder.ogg', 150, 1)
 		take_damage(min(1 + round(sqrt(acid_level)*0.3), 300), BURN, "acid", 0)