When I try to clone a redstone contraption I made myself /clone command actually does its job but things then get totally broken: I cannot open menu, pick blocks and dounds completely disappear.
Last but not least, by saving and quitting the game is not able to save and stays in saving screen for a non definite amount of time since I closed it after 2 minutes waiting.
When you get back to the world it restarts at the exact position you was before using the clone command.
Linked issues
Comments

Thank you for your report!
We're actually already tracking this issue at MCPE-109119, so I will resolve and link 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.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki