Help with Land Barriers in Caves

[skittles sour]

Hey there friends, so I'm trying to do an underground waterlogged biome with a giant tree in the middle growing out from the abyss. I currently have the code of the setpiece like this and the room like this. I used a noise tile function is to fool the worldgen into not removing the prefab despite it being on an impassable tile.

 

layout = {
	watertree_pillar = {{x = 0, y = 0}}, 
}, 
ground_types = {
	MakeNoise("mm_green_fakeground", function()
		return WORLD_TILES.IMPASSABLE
	end)
}, 
ground = {
	{1, 1, 1}, 
	{1, 1, 1}, 
	{1, 1, 1}, 
},

 

However, when I walk towards the giant tree, I am able to walk onto the impassable tiles. I think this is because the world still remembering the tile as a walkable tile? Would anyone have ideas on how to execute this idea more correctly? Many thanks in advance!

Edited January 17, 2025 by skittles sour