Help 2D Animation in 3D Surrounding

[Klaas]

Note though, that colliders in a 2D particle system only work in a narrow band along Z = 0. If you take the entire scene (not only the emitter) away in the Z axis, they will stop working.

Hi, this kind of helped!

I moved the entire scene closer to the z-axis and will put all 2D Emitters on that axis. Not the most beautiful solution, but that shouldn't be a problem.
Nonetheless, the colliders still act strangely. When I start the Game the colliders don't work. If I move the entire gameobject (colliders, emitter and so on) on the z-axis, the colliders work. If I move it back to where it started, it still works! Any ideas where this is coming from?

Greetings,
Klaassum