"Receive Shadows" flickering shadows, and not displaying received shadows

[AlbertAxel95]

Describe the bug
Activating "Receive Shadows" won't display the shadows that the object is receiving, and is also causing artifacts when I move the camera.
I recorded a Video showing the Artifacts in real-time (it doesn't display the shadow of the character either), and I used a second material that uses "URP LIT" and doesn't cause the artifacts and displays the character shadows correctly.

Video
https://drive.google.com/file/d/1sD6z-PULZxRtjrLCKYdGnh8lbWRjFH64/view?usp=sharing

** Toon Shader Configuration **
Here you can see how I have the toon shader configured.

Desktop:
OS: Windows 10 64 bits
Unity Version: 6000.3.1f1
Toon Version: 0.13.1-preview

Additional context
I can make a copy with just the items that I have in this scene, and share it if you are unable to reproduce it.

• I just noticed that the shadows on the character are glitching too (you can see them glitching in the video), the character is also using the toon shader with "receive shadows" active.

[AlbertAxel95]

As promised, here I have prepared a minimal project (just the mesh, the textures, the shader, and the character that you can move around with the WASD keys, you can also move the camera with the mouse).

In this project the artifacts are being reproduced in the "Toon" shader when you activate "Receive Shadows".

I placed 4 walls with the "URP Lit" shader (they don't show the artifact and they show the shadow of the character), and 6 walls with the "Toon" shader (they do show the artifact and don't show the shadow of the character).

Let me know if you are able to see the problem of the shadows flickering.

https://drive.google.com/file/d/1UmWIkavRiRIU0rlSz0JaB0PHXkT7Jh1M/view?usp=sharing

[AlbertAxel95]

Let me know if you are able to reproduce the problem.