From the sides the logs look perfectly normal but if you see the ends of them there's a weird glitchy effect. It's hard to describe how it looks but suffice it to say it's immersion breaking.

The block the log is is situated on causes the world to be see through...through it around the edges where the block is visible

EDIT: This issue was found on 1.16.5

hey, have the same issue, did you find a solution or mod conflict? or was this just with better foliage only?