Upon loading the nether some chunks are positioned outside max Y. Upper loaded chunk has a ceiling of bedrock of 125. Min y floor not populated with bedrock in this glitch.

3 instances, each on 2 systems. 2 maps. 3 tries . First computer, desktop 5700xt, First seed found broke nether from second spawning into nether. Large corruption area. Restarted seed and portaled straight to nether and broke the spawn, yet first occurance was a ways out and not affected. so corruption happened twice in one seed. One so far in 1 other. Rtx 2060 maxq. Been exploring the new snapshot generation and odds are about 2 in 30+? Just seed exploring.  Really enjoying the new generation.

Statistically it looks attached to the seed.
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That first one is a fun seed. Double blaze and a pillager spawn.

Thanks for your work.