This issue still exists in 1.14.3. My iron farm zombie despawned, my wandering villager despawned and my snowman despawned all on my survival career. Ironically, my villager trading hub still runs strong and those are unnamed. @James I am using glass in two of the three instances, but not glass panes. In the third instance however, my wandering villager was just contained by standard cobble. he vanished out of thin air as well. Does not appear to be solely, or even in part, a glass issue
This issue still exists in 1.14.3. My iron farm zombie despawned, my wandering villager despawned and my snowman despawned all on my survival career. Ironically, my villager trading hub still runs strong and those are unnamed. @James I am using glass in two of the three instances, but not glass panes. In the third instance however, my wandering villager was just contained by standard cobble. he vanished out of thin air as well. Does not appear to be solely, or even in part, a glass issue