You can see the bug in this video: https://youtu.be/JJKXV_gehjk
This is not the first time I've Seen this bug. I noticed that this happens after the player sleeps. Mobs stop responding to any impacts and don't move. Only re-entering the game helps.
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I have now got this error, however they can stop moving when i move away, however although they appear stationary they are invisibly moving around attacking me!

Thank you for your report!
We're actually already tracking this issue at MCPE-71243, 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

Thank you for your report!
We're actually already tracking this issue at MCPE-71243, 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
I have now got this error, however they can stop moving when i move away, however although they appear stationary they are invisibly moving around attacking me!