I encountered this bug in previous snapshots. I started a world in 20w17a and encountered the bug after 20w20a. I figured the bug would be fixed, but after starting a new world in 1.16, I encountered the same bug in around the same spot in a flower forest biome. The seed is -1881547168, coordinates in screenshot.
Added second screenshot for floating tree over a grass block near water.
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-610, which is a report that has not been resolved yet.
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