Problem with the snow drift decoration being invisible

There's a problem at least with the Celestial Nebula tileset : the decoration does not appear on the ground sometimes :



If you want to see it here's my hideout where I use a lot of them and only a part of them appear while the others remain invisible (it's ruined now because of this :/) :

https://hideoutshowcase.com/hideout/show/1731/title/Arctic%20Expedition