When a piston is placed by a player who then turns their head away before the server registers the placement, a second piston head will visually appear extending from a different side of the piston. This piston head is only the result of a client-server desync, since right-clicking on it or saving and reloading the world makes it disappear.
How to reproduce:
This is the most consistent way I've found to reproduce this issue. A video of these steps is attached below:
[media]Place a redstone block.
Position yourself one block diagonally away from the redstone block.
Give yourself a piston.
Run the command:
/tick rate 1Rotate the camera so that you are looking at the redstone block at an angle of exactly 45, 135, -135 or -45 degrees.
Turn slightly to your left (or right).
Right-click with your piston on the redstone block and quickly turn slightly to the right (or left, respectively) of the diagonal you were previously facing.
→ ❌ The piston grows two heads.
Expected result:
A piston with one piston head would be normally placed.
Observed result:
A piston with two piston heads facing different directions was placed.
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is duplicated by 25
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Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.
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When you tested in vanilla, were you able to create the piston in vanilla? Or was it created using modifications and then simply moved over to vanilla?
If you place a block in front the piston before reproducing the bug the block also seems affected. This is only visual and if you interact with the block it will go back to normal, you can still stand in the block but other entities such as items, eggs/enderpearls or mobs will still go trough them. Video
Also, I tried this on 1.20.4
I've found a really simple and consistent way to reproduce this issue, which follows:
Place a redstone block.
Position yourself one block diagonally away from the redstone block.
Give yourself a piston.
Run the command:
/tick rate 1Rotate the camera so that you are looking at the redstone block at an angle of exactly 45, 135, -135 or -45 degrees.
Turn slightly to your left (or right).
Right click with your piston on the redstone block and quickly turn slightly to the right (or left, respectively) of the diagonal you were previously facing.
Watch the piston grow two heads.
Even though this way to reproduce it is simple, the steps described above might make it look complicated, so I've attached a video of me following them as well:
[media]
Please attach a screenshot of this occurring while the F3 debug screen is enabled.
This issue is being temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki