Strange behavior can occur when SMB is unchecked and flapping Animation not present

[NickolausDS]

When Flapping SMB (animation State Machine Behavior) is unchecked and no flapping animation is present, the flight object is sent outside world coordinates.

The reason is most likely how flapping applies force. Force is applied on a per-flap basis. When no animation is present, the object is able to flap hundreds or thousands of times a second, each with substantial force. The result means the object is quickly and forcefully ejected from the plane of reality where floating point numbers make sense.