Set initialized = FALSE on unsimulated turfs that need to intialize.

code/game/turfs/unsimulated.dm

@@ -10,6 +10,7 @@
 	icon = 'icons/turf/space.dmi'
 	icon_state = "0"
 	dynamic_lighting = FALSE
+	initialized = FALSE
 
 /turf/unsimulated/fake_space/Initialize(mapload)
 	. = ..()

code/game/turfs/unsimulated/beach.dm

@@ -14,6 +14,7 @@
 /turf/unsimulated/beach/water
 	name = "Water"
 	icon_state = "water"
+	initialized = FALSE
 
 /turf/unsimulated/beach/water/Initialize()
 	. = ..()

code/game/turfs/unsimulated/planetary.dm

@@ -9,6 +9,7 @@
 	density = 1
 	alpha = 0
 	blocks_air = 0
+	initialized = FALSE
 
 	// Set these to get your desired planetary atmosphere.
 	oxygen = 0