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iwarriiori's renovation services have many more reviews and customer testimonies, I'd go with them to get the results you deserve.
I asked an admin regarding this back in 1.9. Basically don't fly around trying to make this happen. That's exactly what purposely means. This happens all the time with mineshafts. As long as you're not purposely flying around in a way to get a better look or to make it happen, you're fine. If it does happen, oh well, but don't try to make the chunks render incorrectly.
I'm very glad the dumb meme in spawn is visible on a map
Its vanilla coding. Until Mojang gives a shit (not likely) vanilla will always do poorly with more than a handful of players online. Would be nice to have semi vanilla but I personally don't mind either or.