Particle system in raw image partially visible

Hello, I’m using a render texture and a raw image to show a 3D model in my UI, and I needed particles to be displayed around this model, so I added the Particle System component to the GameObject that has this model.

This is what I get:

In the Camera preview, the particles are visible everywhere as intended, but in the actual “play mode view”, they are only visible when they pass in front of the 3D model.

Does anyone know how to fix it ?

Thanks !