Using rule tiles with Tilemap.SetTiles()

Questions & Answers
1

I have code that collection positions and tiles and then does this:

_walkableTilemap.SetTiles(
  walkableTilemapPositions.ToArray(), 
  walkableTilemapTiles.ToArray()
);

When walkableTilemapTiles hold regular Tiles it works fine however when it hold Rule Tile, nothing happens (no errors but the tilemap is not updated. How do I get rule tiles to work with Tilemap.SetTiles()?

Another weird that I notice if the the rule tiles work if there are up to 4 tiles being updated, once I am at 5 of higher, it then stops working.

// works
var t1 = new Vector3Int[] {
  new Vector3Int(6, 5, 0), 
  new Vector3Int(7, 5, 0), 
  new Vector3Int(8, 5, 0), 
  new Vector3Int(9, 5, 0)
};
var t2 = new TileBase[] {
  _floorTile, 
  _floorTile, 
  _floorTile, 
  _floorTile
};
_walkableTilemap.SetTiles(t1, t2);

// does not work
var t1 = new Vector3Int[] {
  new Vector3Int(6, 5, 0), 
  new Vector3Int(7, 5, 0), 
  new Vector3Int(8, 5, 0), 
  new Vector3Int(9, 5, 0),
  new Vector3Int(10, 5, 0)
};
var t2 = new TileBase[] {
  _floorTile, 
  _floorTile, 
  _floorTile, 
  _floorTile, 
  _floorTile
};
_walkableTilemap.SetTiles(t1, t2);

Not sure why this is but thought it might be related so figure I would mention it.

2

Guess this is a bug: https://forum.unity.com/threads/2021-2-0f1-tilemap-settiles-not-working-as-previous.1190572/#post-7624684