Overlapping 3D RigidBodies not moving with the physics engine.

[Ramshell]

Godot version:
3.2 stable

OS/device including version:
Ubuntu 19.10
Issue description:
I want to reproduce this behavior in 3D:

The rigid bodies are set in Character mode, and the gravity is set to 0.

When I try to do that same in 3D (locking the Y-axis in the rigid body) I get this result:

The bodies stay still no matter what.

Minimal reproduction project:
minimal_reproduction_project.zip

[pouleyKetchoupp]

ConcavePolygonShape is not supposed to be used for moving rigid bodies. There are warnings about that on the CollisionShape nodes in your project:

ConcavePolygonShape doesn't support RigidBody in another mode than static.

It works as expected if you use a ConvexPolygonShape or BoxShape instead, so closing.