Edit: Duplicate (sry can´t delete) =>
All Entities or Mobs can disappear upon going away too far and/or dying or reloding the save state.
Example: I had a village with an Iron golem and a big Farm with sheep, cattle, pigs and chicken. After I went looking for a stronghold and came back all of them were gone. Reloading the save state didn´t help. Reloading the game the other day made them appear again.
Edit: I have included now screenshots from another farm where I have encountered this problem. A save game reload has solved the error for this one.
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However, this issue is a Duplicate of MC-144784.
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