Hi Adam,
Premiere Pro keeps the original clip's internal duration for motion keyframes, even if you extend the clip in the timeline (e.g., via time remapping or speed changes). So if you keyframe beyond the original duration, the motion stops because there's no more "real" footage to interpolate.
Your workaround of nesting is the best, but probably the fussiest.
Another thing you can try is to create a freeze-frame, edit it to the clip, and then apply an effect to the freeze-frame.
You can also create a hold frame and then apply motion keyframes to that.
I hope that explains the situation. Let me know if you have any questions.
Thanks, Kevin
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