Painting TileMap with terrain with unset peering bits does not work as expected.

[s0tfs]

Godot version

v4.0.dev.custom_build[78931aa]

System information

Linux

Issue description

I have setup a terrain set with a single terrain like this:

The set peering bits are red. If I try to paint this terrain in [78931aa] it does this:

While back in [d9d5296] it looked like this:

Using a terrain set with multiple terrains where all peering bits are set to a terrain seems to working fine though.

Steps to reproduce

Open the attached minimal project and paint the terrain.

Minimal reproduction project

terrain_test.zip

[Calinou]

cc @groud

[himaghnam]

got the similar issue, single tile does not work like autotile, i was trying to have the platformer tileset

[himaghnam]

need selected tile rotation too - Rotating a tile before painting

[AttackButton]

Got this in the new alpha 1.

need selected tile rotation too - Rotating a tile before painting

Is this a workaround?