Resolved 2D Sprite not receiving shadows

Hello everyone,
I'm trying to have my sprites receive shadows. Now it's a special one, so bear with me :

I create the global layout of the level using Grids. I then generated shadow casters using this bad boy (works fine, as seen in that screen).


Now I try to populate my levels with sprites that aren't to be alined with the grid. But as you can see, they don't receive the shadow casted by the ceiling, when the background walls are.

Here are things I've explored :
- Setting up Receive Shadow throught the Debug options on my sprite
- Making sure my sprite and the background (that are receiving the shadows) are on the same sorting layer & same order in layer, and same Rendering Layer
- That my lights and ceiling cast shadows (which they deo, just partly)

I feel I'm missing something super simple... What is ?
Thanks in advance !

 

Okay, eventually fixed it, I used the Sprite-Lit-Default material from URP instead of the default Material.