Alright so starting off, I'll bet you cant solve this issue, like $5.
But you are up to the challenge!
Here you go!
Here is the Report: https://pastebin.com/Mh0eQsBk
Should you be able to solve this, you will be in my hall of fame. Me and 3 other Devs have been working on this for ages
The system works in Single player; not when joining a server. that's when they crashAnd here is the hard paste for those who dont like links
Turn off OptiFine's "Multi-core chunk loading" in the menu before loading world.
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Say something silly, Laugh 'til it hurts, Take a risk, Sing out loud, Rock the boat, Shake things up, Flirt with disaster, Buy something frivolous, Color outside the lines, Cause a scene, Order dessert, Make waves, Get carried away, Have a great day!