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When I play on my Hard difficulty survival world, part of the ceiling of my blacksmith's keeps missing blocks.

What's interesting is that it looks like a creeper explosion, but the fact that I never saw any creeper there, and that it only happened in that spot, made me think that the cause may be something else.

Before...

and after.

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up vote 20 down vote accepted

The wood is catching on fire and burning from the lava.

If there is an adjacent flammable block (e.g: wood above), lava can create fire in air blocks in this shape:

5*1*5 on top of 3*1*3

You should be able to move your roof up one, make it out of non-flammable blocks, or put blocks such as torches in all the spots that fire could occur in order to block it.

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3  
Ah, yes, the famous Minecraft fire strikes again. – Dragomok 17 hours ago
    
Making your ceiling higher or your floor lower would work too – DonyorM 8 hours ago

Adding on the what @colorfusion said, to avoid rebuilding, enable cheats and enter the command /gamerule doFireTick false. Hope this helps!

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