When I place a slab above a leaf block adjacent to a Grass Path Block, the leaf block should be visible through the small gap created by the path block. Instead, the leaf block dissapears, creating a visual "x-ray bug".
Steps to Reproduce:
1. Place a Grass Path, then, dig a 1x1 hole in any direction right next to it. Place an Oak Leaf Block in that slot you created.
2. Put a Slab Block above the Grass Block.
3. Notice that the Leaf Block can't be seen through the gap created by the Grass Path anymore.
Note: It only can be reproduced with the "Better Leaves" feature on.
Added by @unknown:
With Fancy Leaves turned on. Affects all species of leaves. The slab can be a bottom slab, top slab, or double slab. When a top slab is used, the top texture of the leaves is rendered. The side texture is not rendered at all, so the sky can be seen above the grass path.
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Still an issue in 1.16.210.53 Beta.
affects 1.17.30.22

This applies to farmland as well as path blocks, and does not require slabs.
Place any solid block on each side and bottom face of a leaves block, and any solid block or slab on top of the leaves block.
Replace one of the solid blocks on the sides or bottom of the leaves block with either a dirt path or a farmland block.

Affects 1.17.41

Affects 1.19.73
Steps to Reproduce:
1.Place a leaf block and path block next to each other
2.surround the leaf block on the remaining sides with any block
What happens:
It creates an X-ray glitch
What should happen:
It shows the leaf block though the path gap

affects 1.20.40