Named Hostile mobs often De-Spawn or disappear randomly in our realms.

Named Hostile Mobs often de-spawn for no reason (Using nametags),I have searched and found out that if an Unloaded chunk were to have happen where the named Hostile mob was, The Mob would disappear. (Thats the information I found on reddit). In my case a Baby zombie that was riding a horse. not only that the Baby Zombie disappeared along with the passive mob it was ridding (both named: Joe >Baby Zombie and Mama> The Horse) The horse was leashed to a fence as the baby Zombie was riding.. But this was not the only case. Named slimes often disappears as well, more often than the other Hostile mobs.. It's not the biggest problem but for me who is building a place to capture each and every possible hostile mob is very hard for me to do.. with the bug.

So please help.

-Love.. a Random Minecraft player with a passion for coffee.