Fusion consistently raises an exception with "RuntimeError: 2 : InternalValidationError : featureAtIndex" when trying to move a timelineObject to the end of the timeline using .reorder(-1) or .reorder().
However,
timelineObject.reorder( design.timeline.count - 1 ) # move it to the 2nd last position
design.timeline.item(design.timeline.count-1).reorder(design.timeline.count-2) # swap the last and second last
works like a charm.
...so, we know the attempted .reorder(-1) was achievable
and, we have a workaround.
-Dave
