[Scripting Question] Problem adding a new terrain type in 17.2

So I want to create a new terrain type, such that, if the player walks into tall grass, different Pokemon to those that spawn in the regular grass appear.

I have followed this tutorial on the Pokemon Essentials Wiki;

Adding_a_new_terrain_tag_for_wild_encounters (Unfortunately I can't post the link as I haven't posted 5 times yet.)

but I suspect it isn't working for 17.2 - I follow the tutorial, go into the PBS encounters file, set the encounters up there, go into the debug menu and change tall grass to have the correct terrain type. But then when I walk on the tall grass, the Pokemon that should be appearing for just "Land" appear with no sight of the Pokemon I set to appear in the tall grass.

What do I need to do to get this working? Thank you for your time.

-Masey

I'm an idiot... I didn't change the tileset to the correct one when changing the terrain type of long grass in the debug menu.