In some places (mostly oak forests) Minecraft has lots of trouble rendering the terrain, and it does not do this in any other version, including a previous snapshot I tried (18w43b). This happens in all worlds and tweaking the video settings has no effect on it.
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Thank you for your report!
However, this issue is a Duplicate of MC-138114 / MC-138108.
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Had the exact same problem in a flat world jungle.