mostly works!

occasional deadlock at last test; gonna keep checking that out.

code/game/turfs/change_turf.dm

@@ -156,6 +156,7 @@ GLOBAL_LIST_INIT(blacklisted_automated_baseturfs, typecacheof(list(
 	else
 		if(ispath(path,/turf/closed))
 			flags |= CHANGETURF_RECALC_ADJACENT
+			update_air_ref(-1)
 		return ..()
 
 // Take off the top layer turf and replace it with the next baseturf down

code/game/turfs/turf.dm

@@ -92,6 +92,7 @@
 		var/turf/open/O = src
 		__auxtools_update_turf_temp_info(isspaceturf(get_z_base_turf()) && !O.planetary_atmos)
 	else
+		update_air_ref(-1)
 		__auxtools_update_turf_temp_info(isspaceturf(get_z_base_turf()))
 
 	return INITIALIZE_HINT_NORMAL