How to reproduce the bug:
1) Create a new world in the latest Beta/Preview.
2) Teleport to coordinates beyond X/Z ±2,812,333
3) Locate a mountain biome
Observed results
Generates a deep hole that reaches to Bedrock level with lava
Aquifers may still generate.
Villages and other structures generate too. Tested in a single biome world (using the "BiomeOverride" tag in world NBT)
Expected results
Normal mountain
Linked issues
is duplicated by 8
Attachments
Comments 6

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I edited the bug report and now it's more detailed!
Thank you for your report!
However, this issue has been closed as Won't Fix.
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The issue is primarily that Bedrock Edition can only support numbers up to 232 causing precision calculations to fail. This issue is nearly impossible to fix (at least right now) because of this limitation. To fix this would require a massive reworking of the internal structure of the code and could cause catastrophic issues. This is why these issues shall not be fixed. I expect though, that it is something the developers are looking into based upon the push for seed parity and the like.

I wonder if this happens in the full release… as terrain generation was further improved.
Forgot to say, the post might be unclear