Two blocks generated at Y levels 104 and 105 when it is supposed to only generate at low levels according to the wiki.
The seed of the world is -1758184068 and then you can teleport to 680 103 357 in the nether, you will be inside a block and when you break it you should see the 2 blocks of ancient debris.
Thank you for your report!
We're actually already tracking this issue at MCPE-69053, so I will resolve and link this ticket as a duplicate.
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