When placing a Redstone block on top of a piston and then a 2nd one above that same redstone block the piston will enter a state of permanent activation "even when the redstone blocks are removed." If a piston "facing up" has a redstone block on it and is triggered by a redstone signal the piston will then stay permanently powered as well.
Steps to recreate
1. Place Piston
2. Place "Redstone Block" above "Piston."
3.Place second "Redstone Block" on first "Redstone Block."
4. Remove First "Redstone Block" then remove second "Redstone Block."
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Comments
migrated
violine1101
Thank you for your report!
We're actually already tracking this issue in MC-108, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. That means that this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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migrated
sounds like the bud piston