I have the issue that whenever i go to the nether and come back to the overworld 10 to 15 chunks don't load. I can resolve that by restarting the world but its hell of anoying to restart each and every time i go to the nether. This problem happens even to people that play on my world the need to go out and come back to resolve the issue.
The only soultion at the moment is every time someone enters ore lefts the nethe the render distance must be turnt down to the lowest possible and after leaving each side turn it up again. The chunks shouldnt dissapear anymore. Its anoying i know but at the moment its the only way without closing the application every time. Be aweare that if you play with low render distance elytra flying could be realy dangerous so look out my fellow miners xD