relates to:
https://mojang.atlassian.net/browse/MC-1677
https://mojang.atlassian.net/browse/MC-5726
if a block is placed on the face of a horizontal, fast firing piston during a small window where the piston is retracted (aim for bottom edge), the block can be duplicated.
(not seeing any open copies of this bug, it seems to be a repeat offender though)
Related issues
duplicates
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migrated
kumasasa
Please attach a screenshot.
migrated
to duplicate in survival mode (and be able to mine the blocks "in flight") I used Birch logs and a diamond ax with "efficiency V".
started with a stack of 64 Logs, screencap shows 63 on hotbar + 2 on piston after placing 1 that got duped to 2.
migrated
On further inspection, the created block (farthest from piston) Is solid, and can be stood upon and cannot be walked through from the side, but does not drop a block when mined. I suspected it could be a block id conflict with 2 instances of the duped block (blackbox test assumption) so i duped the block in survival, switched to creative, removed the block that would have dropped a birch log item wen pined, switched back to survival, and tried to mine the dupe block, but it still did not drop anything.
kumasasa
Then it's a duplicate of MC-631 , isn't it ?
migrated
it appears so. block disappears on reload and update as well. (also caught the piston "deleting" blocks,like the video in that ticket) so please feel free to close and link. Sorry for the dupe.