Despawn

On my Minecraft Pocket Edition latest version for the Android running off a LG Stylo 5. Every time I log out and log back in of my game the animal entities and villager entity's despawn. This is after I name them with a name tag, interact with them and in my latest attempt to play the game the second time I logged into the world they despawn immediately. I have reported this problem before, And i was told it was a duplicate and resolved. It is not resolved because it continues to happen. no matter how many worlds I start up no matter how many times I save it is continuously despawning these entities.  please do not just tell me that this complaint is a duplicate. I would like to know what i can do to fix it or what you are doing to fix it. Because send me an email saying duplicate and fix. Has not fix the despawning problem I am having.it has been over 3 months and i have been very patient. But i would love to play the vanilla game i paid for and if it helps I have never installed a mod to my game.