Redstone is placed on top of a sticky piston to power it. When the redstone is activated, the piston activates, and breaks the redstone on top of it. The broken redstone stops the connection, hindering continued usage of the piston.
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Thank you for your report!
We're actually already tracking this issue in MC-93631, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.