I am not quiet sure whether this is intended or not, but the bone block is handled as if it was a transparent block and I see no reason for it to be like that. It is basically just a pillar block and in general pillars are not transparent.
Also it is a full block (16x16x16) and it does not have transparent textures.
As a result of that, you cant place torches, redstone dust and things like that on top of it (see MC-102051) and it gets rendered even when it is inside of other full blocks. That may cause some tiny amount of unneccasary lag.
Obviously it also lets light through because of that bug.
The only advantage I can see here is that you can spot it even in survival pretty easily by using "features" like MC-57930 if you are in desperate need of bone meal.
I do not think MC-102051 covers the bug I am explaining here, it only says you cant place torches on bone blocks and nether wart blocks.
Also it is not related to the nether wards block that is also described there since this is not actually transparent (faces do not render inside of blocks and it does not let light through)
However, if you want to keep it that way, you should mark [MC-102079] as a duplicate of MC-102051 as well and not as a dupe of this one for consistency.