Just like the title says.
Try yourself: Seed: -2099292593333918843, coordinates: -215 22 841
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This is a seemingly random mechanic and can be achieved by intent. As for the formation of these structures, abandoned mineshafts consist of:
◾A starting point - a large room with a flat dirt floor, an arched ceiling and up to four exits (one in each direction).
◾Corridors - 3×3 block corridors featuring supports made from fences and wooden planks (sometimes complementary with torches), broken rails, chests (containing resources) and cave spider spawners surrounded by cobwebs.
◾Crossings - intersections with wooden pillars, sometimes two floors tall.
◾Staircases - diagonal sections of tunnel.
The generator continues to add pieces onto an exit until it reaches a "depth" of 8 (eight pieces from an exit).
Source: Minecraft Wiki
IIRC, the doors are just all placed in the same direction, regardless of the direction of the wall they are embedded in.
Could somebody provide an updated seed and set of coordinates for this issue occurring via worldgen strongholds, if they still see it happening? The ones in the description no longer match due to world gen changes since the original post's version.
Confirmed for 1.8
http://i.imgur.com/WU10pfU.png
Fixed for 1.9. Jeb's comment (two comments down):
Don't worry, I haven't fetched from the git repository for a while. Grum has fixed those.
dont think this qualifies as a bug its just how the generator made it, example desert temples underground or my fav a jungle temple hanging mid air over a massive sinkhole. Ive seen this always since Ive been playing MC. Are there static models of these structures? I was always under the impression its just basically quasi-random placement of sub-chunks following a 'life' style generator.