Whenever I was trying to test my redstone functions, my game sometimes freezes and then crash. I went back to my world to test it again, but freeze and crash again. This keeps repeating for a very long time. I won't be able to test my function anymore. hope this will be fixed ASAP.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-28260.
Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
If you have not, you might like to make use of the search feature before making a new ticket, as it's likely that the issue has been reported already.
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