I logged into my Minecraft world and discovered item frames and lead ropes floating about 5-50 blocks away from where I originally placed them. I found that the only way to get rid of them was to destroy the block it was originally on, which is very annoying to find where each item frame and lead belong. I hope you find this helpful and I hope you can fix this bug.
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However, this issue has been closed as a Duplicate of MC-143351.
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I have experienced both of the things you specified, so i agree, it needs to be fixed