I've created conveyor belt and and two objects with rigid body physics. But the first object won't fall and second object falls backwards.
How can I fix it?
This is because the rigid body simulation is only taking the initial deformation into account, behaving as if the curve modifier is applied:
To fix this, enable Deforming on the belt object:
This will make the simulator take into account deformations of the object that occur during the simulation.