Motion clips work for a character:
I am able to animate a character, select a range of keys in the collect group row, and export as a motion clip. I can re-apply the motion clip at another point in the timeline, and it works.

Motion clips aren't working for a prop attached to a character:
I am able to animate a prop, and it works. I can save the project and the animation of the prop saves and restores correctly. However, saving a motion clip for a prop is not working. It seems to work, without an error message. However, only the first key in the selected range is restored.

The interface seems to work the same for a character as for a prop, it is just a different row in the Timeline.

Can anyone confirm that prop animation can be saved in motion clips?
or
Does anyone have a suggestion as to what I might be missing / doing wrong?