I am not sure why my ticket was directed to this thread. It was about despawing named mobs and villagers. However this only refers to chunk border issues. The problem i am having is in the middle of a chunk. Unless the work around they listed doesn't actually solve the problem
Read the issue. Because I did read the second paragraph and it says groups despawn in chunk and persistent mob despawn at border. Recommend fix is to not place near chunk borders. So I clearly state again I am not sure why I was pushed together with this thread. The Recommend fix is and I quote" We are still working on a solution for this issue. Currently entities can end up being lost if they happen to be positioned on the boundary between two chunks when the game crashes. One workaround for this is to position mobs away from chunk boundaries, which can be calculated using coordinates." So it has nothing to do with a resolution for my issue.