User262545
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The same happens in 18w08b, also notice that the upper block is missing.
It appears that you have to be near to the Woodland mansion to unlock the woodland explorer map trading option. The locate Mansion command doesn't work either. There should be a way to get the map even if you're 100k blocks away from the mansion.
That's why the "make sure you made a backup" message appears. If you made a backup, go to %APPDATA%\.minecraft\backups, unzip your world backup into a folder in %APPDATA%\.minecraft\saves and open it in minecraft. Also, you can use level.dat from another world and change data with NBTExplorer. More about that here: https://minecraft.gamepedia.com/Tutorials/Recover_corrupted_saved_world_data
It happens to me too! I've used preset "Overworld" (Note: it happened 2nd time when I made a superflat world).
Seed: 7355301259404534211
Wondering if updated world generator caused this...
PS: This should be a preset: "Over(Structured)world" 😃
Yes, this is true. For example, in a cave you can walk into a waterfall and you'll get night vision effect, so this can be used for cheating. Note that when you walk out of water, the effect will be gone.
To fix that use full path to the advancement. Example: advancement grant @p minecraft:story/shiny_gear
I've also noticed that in some older snapshots, it appears to be very common and can be quite annoying.
Sometimes happens with fields/gardens as well.