The only way I know of is to open a new comp viewer. Right click on an empty section of the Comp Panel and select New>Viewer, or use the menu under View, or use the keyboard shortcut by basically mashing down on all the keys on the bottom right corner of the keyboard and adding N. Shift + Alt/Option + Cmnd/Ctrl + N, then lock that view to your pre-comp.
Thanks for your response. Unfortunately that doesn't change anything for me. I still don't see any motionpath of my puppet on my precomp.
You may not have the precomp open in the new viewer, where you can then highlight the layer in question and see its motion path.
Did you ever figure it out? I have the same problem.