I was building a enclosed tunnel through some hills, placing dirt blocks above to roof the tunnel then noticed this. there had been a tree with vines above this, and when i placed the dirt roof, this artifact was left.
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Duplicate of MC-1340, please use the search function to see if your bug has already been submitted. Currently over 50% of tickets are being closed as duplicate.
Duplicated by https://mojang.atlassian.net/browse/MC-1340