So, me and my friend have a server on aternos and in our iron farm, we had 3 renamed zombies to speed up the iron production, but sometimes all our zombies disappear. There is no direct sunlight shining on them, there is a roof made of bottom slabs and we also sometimes enter the End and nether if it helps resolve the bug.
PS: also happened in 1.14.2 and 1.14.4
Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please create a new ticket.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.
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