Xcode 12.5.1 SpriteKit SkScene tile set images not showing

When I start my project the tile added to my SKScene using the editor do not appear until after I have clicked on the tiles that was selected in the scene setup. Anyone any ideas why> Also should these tiles be in the list shown to the left of the scene as those sprites (not part of the tileset) I dragged into the scene are. I have attached screen shots of at start and after clicking the tiles.

I am trying the following as another work round for problem with the scene editor. I use the scene editor to remove a tile. I then use the media library and copy in the equivalent sprite image and position it to replace the original. This appears to result in the scene being shown correctly and the item has been added to the list. I feel confidant that doing this for all the tiles I added using the editor will meet the requirements for the app code to work. It a lot more work but I see no other way. Anyone see any reason for not doing this?

Xcode 12.5.1 SpriteKit SkScene tile set images not showing
 
 
Q