The Bug:
Mineshaft platforms can generate floating when near a connected mineshaft platform.
Here is an example:
Version: 1.19.3
Seed: -1374521101267461444
Coordinates: /execute in minecraft:overworld run tp @s 1135.46 -52.00 5.39 -46.77 68.06
Steps to Reproduce:
Generate a world with the seed provided above and teleport to the given coordinates.
Look closely at the mineshaft platforms.
Take note as to whether or not mineshaft platforms can generate floating when near a connected mineshaft platform.
Observed Behavior:
Mineshaft platforms can generate floating.
Expected Behavior:
Mineshaft platforms would not be able to generate floating.
Related issues
is duplicated by
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Attachments
Comments

Can confirm.

Can confirm.
Seed: -4531006308683535508
Coordinates: /execute in minecraft:overworld run tp @s -493.64 -40.00 -183.47 -3019.97 4.41
Hello @unknown!
The issue you're describing seems more like MC-214989, as the platform floating in your screenshot is not directly next to any other platform.
Same here, but much larger. the seed is: 4574021458944116536
[media]Can confirm in 21w08b.
Can confirm in 21w11a.
(seed: 6925904453966683040, x: -91, y: -10, z:1656)
Can confirm in 1.17. Found a mineshaft corridor without chains.
Seed: -2816518439689809411
Coordinates: /execute in minecraft:overworld run tp @s -2854.19 -35.55 -690.22 12.62 53.70
[media]Can confirm in 1.18.1.
[media]Version: 1.18.1
Seed: -7637587106394010081
Coordinates: /execute in minecraft:overworld run tp @s 71309.33 -6.21 -132.22 -774.34 40.43

Confirmed in 1.21.4 prerelease 1.