Stick to full releases or report the bug to mojang.
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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!
Oh good I had this exact issue and I thought it was just something wrong with my world (this is a world that I plan to make a map one day so I was scared as hell since MCEDIT doesn't work for 1.13's new world saves. P.S I didn't even realize that it was pre release 9 now