Leaf blocks of all types pulse when using fancy graphics, although this effect only starts when the leaf blocks are a moderate distance from the player.
Compared to in the screenshots below, this is much easier to notice in game.
I do not believe that the seed affects this glitch, but I will list the one I was using for the screenshots anyway.
Seed: 2891553578603623720
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duplicates 1
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However, this issue has been closed as a Duplicate of MC-161877.
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For some reason, after a few minutes of afking in the same world, the glitch dissipated. This leads me to believe that this glitch is mostly prominent soon after the world has been created.