When you place 2 garden paths next to each other, the light level on those blocks are 0. All light levels around it are unaffected.
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As per https://bugs.mojang.com/browse/MC-84441 the grass path acts similar to farmland with this behaviour.
However, when I stand on farmland, a light level is still shown.
I appreciate that this is functioning as intended mechanically, however shouldn't the diag output from F3 still show a light level to be consistent with other blocks?
Farmland has a full 1 by 1 by 1 hitbox, and you don't sink away in it like you do on paths, hence the difference. Stairs, slabs and other non-full blocks show the same behaviour as paths.
Hmm, so it's this bug https://bugs.mojang.com/browse/MC-46667 ?
The light level inside blocks is 0, that's working as intended. Comparing it to farmland doesn't work because farmland is actually a full block high when you walk on it. This is MC-22319, which I will re-open now as the same issue was also fixed for path blocks.
This is intended behavior caused by the slightly smaller hitbox of path blocks. Your Y level is 66.94. That means your feet are inside of the 1 by 1 by 1 block space of the path blocks if you're standing on it, and the light level inside an opaque block is always 0. This has no effect on mob spawning or rendering.