TileMap.set_cells_terrain_connect() ignores diagonal tiles connections

[Igorrreha]

Tested versions

• Reproducible in: Godot v4.2.1.stable, Godot v4.3-dev5

System information

Godot v4.2.1.stable - Windows 10.0.19044 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1650 (NVIDIA; 31.0.15.4633) - Intel(R) Core(TM) i5-10300H CPU @ 2.50GHz (8 Threads)

Issue description

Terrain sets with mode "match corners and sides" don't connect diagonal tiles as their peering bitmask describes.

Expected pattern:

Real pattern:

Video:

demo.mp4

Bitmask:

Steps to reproduce

Open MRP

1. Open "res://demo.tscn" scene
2. Go to tilemap window
3. Open "terrains" panel
4. Select "ground" terrain
5. Select "connect mode" tool
6. Try to draw some tiles on terrain
   

Minimal reproduction project (MRP)

diagonal-tiles-bug.zip

[Igorrreha]

Important thing!

I wrote this tool script and found out that TileMap.set_cells_terrain_path() works fine and only the TileMap.set_cells_terrain_connect() method works buggy.

@tool
extends EditorScript


func _run() -> void:
	var tilemap = get_scene() as TileMap
	tilemap.clear()
	
	_terrain_path(tilemap, [
		Vector2i(0, 0),
		Vector2i(1, 1),
		Vector2i(2, 2),
	])
	
	_terrain_connect(tilemap, [
		Vector2i(4, 0),
		Vector2i(5, 1),
		Vector2i(6, 2),
	])


func _terrain_path(tilemap: TileMap, cells: Array) -> void:
	tilemap.set_cells_terrain_path(0, cells, 0, 0, false)


func _terrain_connect(tilemap: TileMap, cells: Array) -> void:
	tilemap.set_cells_terrain_connect(0, cells, 0, 0, false)

Test result:

[VIRTUALXN]

Hello friend, I have also noticed that this function seems to have some issues, but I am not sure if it is the type you described, but it does not work properly

[VIRTUALXN]

[VIRTUALXN]

[VIRTUALXN]

The set_cells.terrain_path I am using is also abnormal.