Peering between multiple terrains in Godot 4?

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Peering between multiple terrains in Godot 4?

FrobtheBuilder

So I wanted to use the new terrain system (the replacement for autotile) with both sloped and corner pieces in a Godot 4 project. That means multiple tiles with the same peering bits, or to put it a different way, multiple terrains that peer between each other. Godot 3 had a nice workaround you could use to enforce peering between different autotiles, but this seems to be impossible now?

The _is_tile_bound hook seems to just be missing from the new API. The terrain system in general is kind of poorly documented so I was wondering if there were still a way to do this. I tried making multiple terrains in one set, multiple terrain sets... you just can't have a tile peer with two terrains no matter what you do.