I'm not sure why the second beacon didn't register, but it meant I failed the mission. My current ideas are that the beacon somehow landed on the edge of the platform and didn't count as a result, or that I planted the beacon while a text box was still on screen, causing it to fail somehow. It could be something else, though.
Edit: I did a little testing and I'm pretty sure the problem was that the beacon landed on the edge. If you play this game, just make sure you're against (and facing) the wall when you set the beacons. Setting it with a text box on screen didn't seem to matter
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