Steps to reproduce:
1. Create project using 3D URP template
2. Create Cube GameObject in the project
3. Make sure Cube GameObject is selected in the Hierarchy window
4. In Inspector window, change Scale Z value to 0
5. Observe Scene view

Actual results: Light artefacts are visible in the Scene view, light is too bright
Expected results: No light artefacts visible in the Scene view

Reproducible with versions: 2023.3.0b7, 6000.0.23f1, 6000.0.24f1, 6000.0.29f1
Not reproducible with versions: 2022.3.50f1, 2023.3.0b6

Tested on (OS): MacBook Pro, 2021 (M1), Sonoma 14.5, Windows 11, Ubuntu 22.04

Notes:
Reusing the same project and downgrading it has a different regression point:
Reproducible with: 2023.3.0a18
Not reproducible with: 2023.3.0a17