Surprised i couldn't find any prior reports about this. Coordinates and seed provided but this should happen for the great majority of mineshafts.
Seed: -2480131086480205661
Coordinates: /execute in minecraft:overworld run tp @s -203.83 39.00 -215.01 -56.85 -37.95
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Also you should probably add the seed and coordinates to the description
Can confirm in 20w51a, using the provided seed and coordinates.
Can confirm in 21w03a.
Can confirm in 21w05b.
Can confirm in 21w06a. Here's some an additional seed + coordinate.
Seed: -2753461903604208561
Coordinates: /execute in minecraft:overworld run tp @s 73305.04 -5.00 -3299.01 -245.00 -37.56
Can confirm in 21w07a.
Can confirm in 21w13a.

Can confirm in 1.17.1 Release Candidate 1.

Can confirm in 21w39a.

Can confirm in 21w40a.

Can confirm in 21w41a.

Can confirm in 21w43a.
I can confirm for 1.16.3