When placing a redstone repeater facing right or left in front of a redstone repeater facing towards the other one,the repeater's second torch(the one who moves)will turn into a line of bedrock.
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[media]
Duplicate of MC-4449, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.
Also please review the guidelines before reporting issues. 2 issues with the summary "bug" do not tell anyone what the issue is.