I made a hopper + compator clock, attached to 4 sticky pistons with slime blocks on top. when i ran it, three of the four pistons where pushed up, like normal, but if i flew some distance, but i could still see it. it would some how create for of the blocks. this would continue even if i got close to it again. it would also duplicate any block connected to set slime blocks.
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I noticed this as well.
Steps to reproduce:
Create a redstone clock (my setup was repeater on 2 ticks, into a block with torch)
Hook sticky piston up to clock with block in front of piston
Walk 65 blocks to the side of the sticky piston.
move repeatedly between 64 and 65 blocks away from piston.
Observe the block in front of piston becomes duplicated (cosmetic only)
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attempts to mine the block reduces durability of tool.
no drops when mined.
placing any block ontop duplicated blocks replaces the duplicated block.