makes the tweak (#21195)

code/modules/reagents/reagent_dispenser.dm

@@ -33,6 +33,7 @@
 	. = ..()
 	create_reagents(tank_volume)
 	reagents.add_reagent(reagent_id, tank_volume)
+	update_icon(UPDATE_OVERLAYS)
 
 /obj/structure/reagent_dispensers/wrench_act(mob/user, obj/item/I)
 	if(!can_be_unwrenched)
@@ -41,6 +42,7 @@
 	if(!I.tool_use_check(user, 0))
 		return
 	default_unfasten_wrench(user, I)
+	update_icon(UPDATE_OVERLAYS)
 
 /obj/structure/reagent_dispensers/examine(mob/user)
 	. = ..()
@@ -278,6 +280,11 @@
 	icon_state = "nuclearbomb0"
 	anchored = TRUE
 
+/obj/structure/reagent_dispensers/beerkeg/nuke/update_overlays()
+	. = ..()
+	if(anchored)
+		. += "nukebolts"
+
 /obj/structure/reagent_dispensers/virusfood
 	name = "virus food dispenser"
 	desc = "A dispenser of low-potency virus mutagenic."