Shader Not Working After Unity Update

,

I’ve upgraded from 2020.3.34f1 to 2023.1.0f1 and this seems to have broken something with a shader I’m using in my game.

The result has changed from:
9183641--1279445--2020.3.34f1_shaderWorks.png
To:
9183641--1279448--2023.1.0f1_shaderNotWorking.png

Only the LineRenderer seems to be working; the shader is entirely absent.
I’ve been trying to see what’s going wrong but the only thing out of the ordinary I’ve found is that the shader preview doesn’t seem to be working anymore:

In Unity 2020.3:

After updating to Unity 2023.1:

What I’ve checked:
-Project Settings > Graphics > Scriptable Render Pipeline: Universal Render Pipeline (URP) asset is set
-This asset is a 2DRenderer
-Fooling around with 2D Light settings in a new scene

In short, the shader seems broken in 2023.1 and I’ve no idea what could have caused this.
Any suggestions?

Friendly bump; hoping someone can help me out on this.
If any additional information would be helpful, please lemme know. : )