The bug
Trees and lakes and such seem to generate through Woodland Mansions walls and even floors. The following screenshots are exactly how I found it, I did not place or destroy any blocks.
How to reproduce
Seed: 4384550191293543872
Coordinates: /execute in minecraft:overworld run tp @s 205046.79 67.46 77251.65 -304.86 -4.08
Related issues
is duplicated by
relates to
Attachments
Comments


Confirmed in 16w39c

Relates to or duplicates MC-81467

Confirmed in 16w40a

I found a video somewhere of an entire village generating inside of a woodland mansion 😛 I don't know if I'll be able to find it again, though.

That was just a parody video.

Can confirm for 16w41a

Confirmed in 16w42a

Confirmed in 16w43a

Confirmed in 16w44a

Confirmed in 1.11-pre1

Confirmed in 1.11

Confirmed in 16w50a

Confirmed in 1.11.1

Confirmed in 1.11.2 on seed -1528392416861039717 at -29198.5, 63.0, 15868.5
Can confirm for the first pre release for 1.13, though the trees generating through the mansion seems to be a bit less extreme than in 1.12.

Seems to be fixed in 1.13.1.

Still a issue in 1.13.1, found this while testing another bug.
Seed: -1681911028
Coords: /tp @s 8412 73 -5970 210 10
(I apologize for my previous comment, I looked for 40 mins and didn't find any mansion with this so I thought it was fixed)
Confirmed in 19w09a. This may relate to MC-109363 since lava lakes spawning in a mansion could burn them down.

Confirmed in 19w41a, see MC-163506

unable to reproduce in 20w18a

This can actually still be reproduced for water lakes (see MC-81467), however probably due to world generation changes, the seed and coordinates given in the description don't work anymore.
However, in case nobody can still confirm this for trees (or other non-lake structures) I would leave this resolved in preference to MC-81467.

I have seen this world and can find it in 1.16.2/1.16.3 . It would be disasterous if a lava lake generated instead.
I am actually still able to reproduce this issue in 20w51a, so I'm requesting for this ticket to be reopened. I've attached the seed and coordinates of where leaves can be seen generating inside of a mansion.
Seed: 4384550191293543872
Coordinates: /execute in minecraft:overworld run tp @s 205046.79 67.46 77251.65 -304.86 -4.08

A lava lake generated for me. burned it all down.👎😞
Can confirm in 21w03a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 1.16.5.

Relates to MC-107594

Is this not a duplicate of MC-81467?

@unknown Only partially.

Can confirm in 21w14a

I can't replicate for the trees generating inside, so I suggest marking this as resolved/duplicate, and keeping MC-81467 open for the lakes.

Can confirm in 1.17.1-pre1.

Can confirm for 1.17.1 - pre1
@unknown, 1.17.1 Pre-release 1 has already been marked as affected.

Can confirm in 1.17.1.

I checked about 20 different mansions and couldn't reproduce in 22w15a.
It probably still happens, but it must be much much rarer than in previous versions.
Can confirm in 1.19.
[media]Version: 1.19
Seed: 4373241205666815302
Coordinates: /execute in minecraft:overworld run tp @s 299739.87 83.56 2050.77 785.31 43.76

Affects 23w35a.
[media]

Can confirm in 1.20.6 and 24w21b.
Affects 1.21:
[media]

Confirmed in 1.21.3