I chose the preset 'Desert' customisation for a superflat world, and deleted the sandstone layer. When the game loaded, there were floating mineshafts and a stronghold, along with ground lever spawners. The seed 'lost' is a good example, though it works with almost all worlds. Also, there are sand temples on huge sandstone pillars.
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I have this same bug using super flat, configuration only about 5 blocks high, and mineshaft and others on on 14w8 and 1.7.4
Can no longer reproduce as of 17w48a! 🙂
Probably earlier
i use default superflat has no dungeon,mineshaft but
Strongholds still spawn
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Logan Whetzel This bug has been closed and won't be fixed. Please don't add information and screenshots to it.
Where is the bug ?
If you provide the configuration
you'll get mineshafts