There is actually a difference here

worlds/witness/player_logic.py

@@ -261,17 +261,20 @@ def handle_postgame(world: "WitnessWorld"):
         mnt_lasers = world.options.mountain_lasers
         chal_lasers = world.options.challenge_lasers
 
-        # Goal is "short box" but short box requires more lasers than long box
+        # Goal is "short box" but short box requires at least as many lasers as long box
+        reverse_or_equal_shortbox_goal = victory == "mountain_box_short" and mnt_lasers >= chal_lasers
+
+        # Goal is "short box" but short box requires strictly more lasers than long box
         reverse_shortbox_goal = victory == "mountain_box_short" and mnt_lasers > chal_lasers
 
         # Goal is "short box", and long box requires at least as many lasers as short box (as god intended)
-        proper_shortbox_goal = victory == "mountain_box_short" and chal_lasers >= mnt_lasers
+        proper_or_equal_shortbox_goal = victory == "mountain_box_short" and chal_lasers >= mnt_lasers
 
         # Goal is "long box", but short box requires at least as many lasers than long box.
-        reverse_longbox_goal = victory == "mountain_box_long" and mnt_lasers >= chal_lasers
+        reverse_or_equal_longbox_goal = victory == "mountain_box_long" and mnt_lasers >= chal_lasers
 
         # If goal is shortbox or "reverse longbox", you will never enter the mountain from the top before winning.
-        mountain_enterable_from_top = not (victory == "mountain_box_short" or reverse_longbox_goal)
+        mountain_enterable_from_top = not (victory == "mountain_box_short" or reverse_or_equal_longbox_goal)
 
         # Caves & Challenge should never have anything if doors are vanilla - definitionally "post-game"
         # This is technically imprecise, but it matches player expectations better.
@@ -287,7 +290,7 @@ def handle_postgame(world: "WitnessWorld"):
         # Challenge can only have something if the goal is not challenge or longbox itself.
         # In case of shortbox, it'd have to be a "reverse shortbox" situation where shortbox requires *more* lasers.
         # In that case, it'd also have to be a doors mode, but that's already covered by the previous block.
-        if not (victory == "elevator" or reverse_shortbox_goal):
+        if not (victory == "elevator" or reverse_or_equal_shortbox_goal):
             postgame_adjustments.append(get_beyond_challenge_exclusion_list())
             if not victory == "challenge":
                 postgame_adjustments.append(get_challenge_vault_box_exclusion_list())
@@ -321,7 +324,7 @@ def handle_postgame(world: "WitnessWorld"):
             postgame_adjustments.append(get_bottom_floor_discard_nondoors_exclusion_list())
 
         # If we have a proper short box goal, long box will never be activated first.
-        if proper_shortbox_goal:
+        if proper_or_equal_shortbox_goal:
             postgame_adjustments.append(["Disabled Locations:", "0xFFF00 (Mountain Box Long)"])
 
         return postgame_adjustments