I will preface this with version 1.12.0 bedrock is absolutely the worst buggiest update ever. Period. You supposedly fixed a bunch of issues that I never had and now not only are water mechanics and Mob's acting up left and right we also have mobs disappearing over many peoples platforms. This has nothing to do with https://bugs.mojang.com/browse/MCPE-47922 so dont redirect or consider "resolved" or duplicate. Because you guys keep closing the actual issue stating people are out of range or other stupid excuses. Consider it! Dont shut everyone down.
My individual scenario has multiple issues. Pre 1.12 i had a endermen farm in the end. Worked great for 6months on the realm i purchased from ingame. "Actual minecraft realm." Playing today and another member and i are wailing out on endermen 20blocks STRAIGHT below the mite (ofcoarse hes named(its been there for 6months). Other player goes up the ladder and the endermen stop coming down i go up to look what happened and the end mite is gone. Player left the end, so he didnt touch it. Im realm owner and other player is also, we are only players and neither of us touched anythin NO EXCUSES NO EXCEPTIONS!! MITE DESPAWNED OR DISSAPEARED. This issnt the first time. I had two mites running in the end and in 1.12 the second mite wont even last 10min before disappearing!!! (again with tags) the mite that survived through the update 6 months old stayed around till today. Now he keeps disappearing!! NOT ACCEPTABLE.!! People keep reporting similar issues weekly dont brush it off let it get voted. It seems to be happening to mobs people are trying to keep... and less to random mobs. Look into that!
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Please remember this is a bug tracker and not a forum for feedback - I can understand your frustration at various gameplay features that are not working as expected, but the best way to get the issue resolved is to provide clear steps to reproduce the problem, and as much relevant detail as possible, including a video and test copy of the world where appropriate.
I believe that the issue you are experiencing here may be the same issue as MCPE-21416, which causes mobs to despawn when the serves stops or crashes (and possibly when chunks are unloaded, though this isn't verified).
Could you provide the exact coordinates of the location where the endermite was located before it despawned, please?
Please remember this is a bug tracker and not a forum for feedback - I can understand your frustration at various gameplay features that are not working as expected, but the best way to get the issue resolved is to provide clear steps to reproduce the problem, and as much relevant detail as possible, including a video and test copy of the world where appropriate.
I believe that the issue you are experiencing here may be the same issue as MCPE-21416, which causes mobs to despawn when the serves stops or crashes (and possibly when chunks are unloaded, though this isn't verified).
Could you provide the exact coordinates of the location where the endermite was located before it despawned, please?
Thank you for your quick response and I will follow through when possible as fast as possible. In the meantime I can assure you that there was no realm crash or reloading of chunks as I was as explained above currently and in process at the farm Actively killing mobs when the mite disappeared. My associate "kybercrystal" will also be helping when he can to further this along. As every other issue of mobs disappearing even with some who are currently videoing their game no one is able to video this issue because it always seems to happen when the mob is not in direct view even if the mob is within viewing distance, and in my case in the same chunk just a few blocks below it. And others the creature was a few blocks to their side.

Thank you for your quick response and I will follow through when possible as fast as possible. In the meantime I can assure you that there was no realm crash or reloading of chunks as I was as explained above currently and in process at the farm Actively killing mobs when the mite disappeared. My associate "kybercrystal" will also be helping when he can to further this along. As every other issue of mobs disappearing even with some who are currently videoing their game no one is able to video this issue because it always seems to happen when the mob is not in direct view even if the mob is within viewing distance, and in my case in the same chunk just a few blocks below it. And others the creature was a few blocks to their side.
Coord 9,65,0 in the end

Coord 9,65,0 in the end
Thanks for the reply - those coordinates would locate the mob directly on a chunk boundary.
Thanks for the reply - those coordinates would locate the mob directly on a chunk boundary.

What he means is the mob may have crossed the chunk border, causing the perfect timing for another mob to spawn and thus your existing one to vanish because there is no more room in the mob cap.
Thanks katie but not possible. The mite was stuck in a minecart in one position with no movement possible

Thanks katie but not possible. The mite was stuck in a minecart in one position with no movement possible
Plus mob cap regardless: named tagged punched and interact with" mobs wouldn't despawn regardless of cap or crossing chunks

Plus mob cap regardless: named tagged punched and interact with" mobs wouldn't despawn regardless of cap or crossing chunks
Thank you for your report!
Crashes such as these are logged automatically, and will be looked into further by the development team.
If you need help or support you might like to follow a link below.
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Thank you for your report!
Crashes such as these are logged automatically, and will be looked into further by the development team.
If you need help or support you might like to follow a link below.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
How do you vote a case up? The same thing happens on my server in bedrock 1.14.0, only me and one player, we collect hostile mobs, exchange damage with them, nametag them and lock them in glass cages, and they seem to dissapear.

How do you vote a case up? The same thing happens on my server in bedrock 1.14.0, only me and one player, we collect hostile mobs, exchange damage with them, nametag them and lock them in glass cages, and they seem to dissapear.

Reopening to resolve as a duplicate of MCPE-21416.

Reopening to resolve as a duplicate of MCPE-21416.