[NO GBP] Supermatter-spawned hallucination anomalies don't spawn decoys (#91634)

code/game/objects/effects/anomalies/anomalies_hallucination.dm

@@ -14,6 +14,8 @@
 		span_warning("Something's wispering around you!"),
 		span_warning("You are going insane!"),
 	)
+	///Do we spawn misleading decoys?
+	var/spawn_decoys = TRUE
 
 /obj/effect/anomaly/hallucination/Initialize(mapload, new_lifespan)
 	. = ..()
@@ -50,6 +52,9 @@
 	)
 
 /obj/effect/anomaly/hallucination/proc/generate_decoys()
+	if(!spawn_decoys)
+		return
+
 	for(var/turf/floor in orange(1, src))
 		if(prob(35))
 			new /obj/effect/anomaly/hallucination/decoy(floor)
@@ -100,3 +105,7 @@
 
 /obj/effect/anomaly/hallucination/decoy/generate_decoys()
 	return
+
+///Subtype for the SM that doesn't spawn decoys, because otherwise the whole area gets flooded with dummies.
+/obj/effect/anomaly/hallucination/supermatter
+	spawn_decoys = FALSE