Failed Attempt at Seasonal Tiles

[lofty haven]

Hi there, I'm trying to make season system similar to what can be found in Zelda Oracle of Seasons for a 2D platformer Puzzle game. By looking at different tutorials and looking up online I came up with my version of Seasonal Tiles: https://github.com/Zornithorinque/Failed-attempt-Seasonal-tiles.git
Basically Tiles are a scriptable object that can switch between several sprite.
I however several problems. First: If two different of these tiles are on the Tilemap, only the first one will be affected by the "Seasonal change". Second: The other tiles don't even have a collider anymore.

I'm not sure what I'm missing to make it work. I would gladly accept help with this problem.