On closer inspection, it seems my good intentions with adding the seeding beacon were counteracted by an End placed in the challenge-awarding character by an earlier me who thought it wouldn't cause any problems.
Terribly sorry about this, and I don't think I'm allowed to upload a fix for it? Either way, restoring should allow you to get the challenge since challenges are preserved across restores (at least, as far as I can remember).
Even worse, it seems the other room I tried adding a seeding beacon for dual challenges to also has this problem.
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109th Skywatcher
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[Last edited by Xindaris at 01-14-2016 04:43 AM]