Using rule tiles with Tilemap.SetTiles()

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.