diff --git a/code/modules/overmap/exoplanets/themes/_theme.dm b/code/modules/overmap/exoplanets/themes/_theme.dm
index fb4a4b9a5da..8864d1a42e7 100644
--- a/code/modules/overmap/exoplanets/themes/_theme.dm
+++ b/code/modules/overmap/exoplanets/themes/_theme.dm
@@ -336,7 +336,11 @@
 	if(!length(ore_seeds))
 		return
 
-	for(var/turf/simulated/mineral/M in block(locate(min_x, min_y, z_to_check), locate(max_x, max_y, z_to_check)))
+	for(var/turf/simulated/S in block(locate(min_x, min_y, z_to_check), locate(max_x, max_y, z_to_check)))
+		if(!istype(S))
+			continue
+		S.update_air_properties()
+		var/turf/simulated/mineral/M = S
 		if(!istype(M) || M.mineral)
 			continue
 		var/coord_to_str = (world.maxx * M.y) + M.x
diff --git a/html/changelogs/johnwildkins-fixlag99.yml b/html/changelogs/johnwildkins-fixlag99.yml
new file mode 100644
index 00000000000..6307c0a7468
--- /dev/null
+++ b/html/changelogs/johnwildkins-fixlag99.yml
@@ -0,0 +1,6 @@
+author: JohnWildkins
+
+delete-after: True
+
+changes:
+  - bugfix: "Fix massive amounts of ZAS updates caused by exoplanets not building their atmos zones when generated."