UV channels render with visual artifacts when 8-bit UV bit depth is used on ParticleSystem Meshes

How to reproduce:

1. Open the attached "IN-142339" project
2. Open the "Scenes/SampleScene" Scene
3. In the Hierarchy window, select both ParticleSystem GameObjects
4. Observe the Game view

Actual result: The ParticleSystem using 8-bit UV depth renders with black/artifacted UV channels
Expected result: Both ParticleSystems (8-bit and 16-bit UV depth) render identically

Reproducible with: 2023.1.0a10, 6000.0.75f1, 6000.3.15f1, 6000.4.7f1, 6000.5.0b8, 6000.6.0a5

Reproducible on: macOS 26.4.1 (M1 Max)
Not reproducible on: No other environments tested