Alpha clipping calculation breaks when sampling both main light and additional lights in URP Lit Opaque Shaders

Reproduction steps:
1. Open the attached “IN-108880.zip” project
2. Open the “SampleScene”
3. Enter Play mode
4. Scroll horizontally in the Game view
5. Observe the “Flower Bed” shaders and all the shaders marked as “Broken”

Expected result: Shaders are flickering/glitching, alpha clipping calculations break
Actual result: Shaders have correct alpha clipping

Reproducible with: 2023.1.0b1, 6000.0.54f1, 6000.1.13f1, 6000.2.0b11, 6000.3.0a3

Reproducible on: macOS 14.6 (M3 Pro) (user reported), macOS 15.3 (M2 Ultra)
Not reproducible on: Windows 11

Notes:

• Also reproduces in the Player
• The same behaviour is observed whether the shaders are rendered through Mesh Renderers, Sprite Renderers, or even UI Images