https://github.com/tgstation/tgstation/pull/71706

code/game/objects/effects/decals/decal.dm

@@ -59,13 +59,17 @@
 		T.AddElement(/datum/element/decal, icon, detail_overlay, dir, FALSE, detail_color, null, null, alpha, appearance_flags)
 	return INITIALIZE_HINT_QDEL
 
-
 /obj/effect/turf_decal/Destroy(force)
 	SHOULD_CALL_PARENT(FALSE)
-	moveToNullspace()
 #ifdef UNIT_TESTS
+// If we don't do this, turf decals will end up stacking up on a tile, and break the overlay limit
+// I hate it too bestie
 	if(GLOB.running_create_and_destroy)
 		var/turf/T = loc
-		T.RemoveElement(/datum/element/decal, icon, icon_state, dir, null, null, alpha, color, null, FALSE, null)
+		T.RemoveElement(/datum/element/decal, icon, icon_state, dir, null, layer, alpha, color, null, FALSE, null)
 #endif
+	// Intentionally used over moveToNullspace(), which calls doMove(), which fires
+	// off an enormous amount of procs, signals, etc, that this temporary effect object
+	// never needs or affects.
+	loc = null
 	return QDEL_HINT_QUEUE