I have noticed a glitch that when I mine a block in survival, it doesn't drop. It is very annoying when it happens with a valuable things like enchantment table, diamond ore etc. Please fix this issue.
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I don't know about mobs disappearing and items dropping after 2 minutes when mined. Actually, I didn't wait for that item to be dropped so I don't know.

MCPE-32038 is one possible duplicate. There is also an issue MCPE-32335 where after charging a bow, then switching to a different item in the hotbar instead of firing, mined blocks do not drop. If you're able to determine that your problem matches either of these, please let us know.
Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response
Does this happen after using a bow or trident, or just randomly?
This ticket will automatically reopen when you reply.
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This happens randomly when I break a block.
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.
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It is not a complete duplicate. In my case, mobs does not disappear when I go close to them.
I had this same issue with an ender chest and blocks in a particular are of my build. Relogging corrected the issue for breaking blocks, but my items were gone. I could see the drops if I backed away, but could not retrieve them. This is either related to or a dup of MCPE-32038