At least "passive" mobs are appearing and disappearing only a few blocks away from the player. 3-10 blocks maybe? Not sure exactly how far.I haven't played enough to see if it applies to all mobs. If one adds redstone devices, it's unplayable. it crashes all the time. I have created a different issue for the redstone already.
Thanks for all your hard work.
Mark
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-32038.
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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