I made 3 maps with /spawnpoint in it and it kept doing that, What I did was i put a pressure plate on Y 201 a block at Y 200 and the command block at Y 199 with the command "/spawnpoint @p" doing that would originally put you on the block above, and now it sends you to the void, so yeah
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Thank you for your report!
We're actually already tracking this issue at MCPE-65487, so I will resolve and link this ticket as a duplicate.
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