The bug
To prevent mineshafts from burning down log pillar supports are unable to generate, this causes mineshafts to weirdly generate floating without any suspension.
With how chain/pillar support generate I assume that if pillars are unable to generate chains hanging from the caves ceiling would replace them but this isn't happening for some reason.
How to reproduce
World type: Single Biome; Lush Caves
Seed: -8508883206669806165
Coordinates: /execute in minecraft:overworld run tp @s -18.45 -35.95 253.58 -3417.38 44.48
Related issues
is duplicated by
relates to
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I can confirm using the provided seed and coordinates. This might be related to MC-216755?

This is related to MC-219203.

Once again this appears to have been fixed in 21w14a but isn't in the patch notes.
This makes me very sad as I am a narcissist

Yeah, they forget to mention many bugfixes in patch notes every snapshot.