In CELESTEMOUNTAIN I set up 3 Challenge Timers for each level and the world as a whole. Since one level finishes directly after the other, the Challenge End Flag for the first level is next to the Challenge Start Flag one of the next level.
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As you can, I started the Challenge Timer for the second level of the world, hence why the Challenge Start Flag is flashing and the Challenge End Flag there is not flashing (different IDs).

However, you can just use the Challenge End Flag there to finish the challenge in a matter of seconds despite the Challenge Flags having different IDs, thus not being linked.
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I believe this is unintended.