TwistedMind Hello, I have a problem about tilemap bitmask. I don't understand and find why some tiles doesn't take the good linked tile. I make a little example to show you what I'm talking about. Note: a script is linked to the tileset to "combine" some cells type. I don't think it has a link with my problem. I use Godot 3.5.1. Feel free to take a look about my work, the questions I ask are for it.
TwistedMind The problem is solved but I don't understand why. Maybe a bug. I make a clean tileSet from A to B and the problem not appears... Maybe because the previous tileset was updated too many times with different textures sources ? Strange thing...