Lines between tiles on godot tileset

If you are having issues with tilesets, like this:

You may want to disable Filter and Mipmaps for your textures

To do that select your texture on the FileSystem view and the Import tab on the upper left part of the screen.

Then disable Filter and Mipmaps and reimport. To me for some reason it was already disabled, enabling reimporting then disabling and reimporting did the trick

Hope that helps!