The motion probe splits the problem in two:
velocity -24, -182, -28 cm/s (a body that cannot climb 9 m in 1.5 s)
mass 1500 kg (the override DID apply)
box 452 x 205 x 40 (correct)
bounds extent 1,1,1 (still degenerate)
actor Z 1393, spawned at 458
The physics body is nearly still while the actor is nine metres above its spawn. So this is not a
force problem at all - it is a transform problem: something writes the actor's transform that is
neither the body's velocity nor our code, which is also what the degenerate bounds are telling us from
the other side.
Next: find who writes that transform. Suspects are the Chaos movement component's UpdateState /
OnUpdateTransform and the component hierarchy - a pawn whose root is the mesh while the physics state
belongs elsewhere behaves exactly like this.
Pawn parked again so the demo stays clean.