After getting back onto my world after updating from 18w46a to 18w47a, I discovered that some blocks in my world in a concentrated area had turned into dirt.
MC-139802
Random logs and blocks in world turned into dirt
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Zachary Simpson
(Unassigned)
Unconfirmed
Minecraft 18w47a
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Some blocks that I had already placed in the past were randomly replaced with dirt blocks...