Reproduction steps:
1. Download and open the submitted project "Particles Bug Report.zip"
2. Open the Sample Scene
3. Make sure that Orthographic projection is set for the Main Camera's Camera component
4. Make sure that Depth Texture is enabled for the Main Camera's Camera component
5. Make sure that Soft Particles are enabled for the SoftParticles Material
6. Enter play mode

Expected result: Particles are rendered in-between GameObjects in the Scene
Actual result: Particles are rendered behind GameObjects in the Scene

Reproducible with: 2018.4.30f1 (URP , 2019.4.17f1 (URP 7.3.1), 2020.1.17f1 (URP 9.0.0-preview.72), 2020.2.1f1 (URP 10.2.2) 2021.1.0b1 (URP 11.0.0)
Not reproducible with: 2018.4.30f1 (There is no Soft Particles settingfor the LightweightRenderPipeline/Particles/Unlit shader)

Notes:
Could not test with HDRP as there is no Depth Texture setting.