In certain chunks treetops or trees at all wont render.
They are there, you can land on the treetops and see the leaf particles, you can harvest the leaves and the tree trunks as if they are there.
I did wait for a minute to see if they would render, but they simply wouldnt appear.
To check it out it happens in this seed: 766785904550281260 in default create world settings.
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Cannot confirm, but duplicate of MC-56917