The Bug:
Igloos can generate without basements but with trapdoors leading to basements.
It's important to note that this report is not about the igloo generating in mid-air; that problem is being tracked on MC-91084. This report (MC-238539) is about igloos have generating without a basement but with a trapdoor. In other words, if a basement isn't generated, there shouldn't be a trapdoor leading to a non-existent basement.
Here is an example:
Version: 1.19.4
Seed: 1359968930092793278
Coordinates: /execute in minecraft:overworld run tp @s 43715.33 64.00 4650.07 -180.93 -49.95
Steps to Reproduce:
Generate a world with the seed provided above and teleport to the given coordinates.
Look closely at how the igloo has generated.
Take note as to whether or not igloos can generate without basements but with trapdoors leading to basements.
Observed Behavior:
Igloos can generate without basements but with trapdoors leading to basements.
Expected Behavior:
Igloos would not be able to generate without basements when there are trapdoors leading to basements within the structure.
Linked issues
is duplicated by
relates to
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Thank you for your report!
We're tracking this issue in MC-91084, so this ticket is being resolved and linked as a duplicate.
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No I'm not sure if you realize the bug is about the fact the basement didn't generate. I am aware that structures can generate over air sometimes

Not sure if this belongs here or in MC-91084, but I found this:
[media]
Can confirm in 1.21
Seed: -4352027212852462983
Location: 8200 100

To emphasize this report, I want to inform that this error also happened to me in version 1.21.4
In my case, there's an igloo with half of the structure in the air and a trapdoor visible from below, but it doesn't have a basement, and that's the main error. I know some igloos can generate naturally without basements, but those that have a trapdoor mean they do have one
Seed: 4076986276051962637
Coordinates: 850, 77, -843
In other words, this igloo has two errors:
Half of the structure is in the air
There's no basement, when there should be one
I can confirm in 21w40a