To reproduce:
1. Open any project win Lightweight set up
2. Create a particle system with "Lightweight Render Pipeline/Particles/Unlit" shader applied to it's (Particle System's) material
3. Enable Soft Particles in addressed material
4. Build for Android (Working as intended in editor)

Result: shader is not rendered / is invisible

Reproduced in packages: 5.7.2, 5.16.1, 6.5.2. 6.7.1
Not reproduced inpackages: 4.10.0

Note: it seems like the values of Near / Far fade are irrelevant as long as Soft Particles are enabled
Note2: Reproduced on Android, Windows Standalone, Linux Standalone
Not reproduced on: Mac Standalone, iOS, Editor