Glass Much Darker When Adjacent to Solid Blocks

I just noticed that glass blocks are significantly darker than they used to be when adjacent to solid blocks, when smooth lighting is enabled.

Throughout my world, I have hidden jack-o-lanterns providing lighting, with a green glass block on top of them. Before, they "kinda" blended in (albeit not perfectly). With the new snapshot, they are much darker and stick out like a sore thumb.

This is best demonstrated by surrounding said block with transparent blocks, as per my "after-multiple transparent blocks" attachment.

Perhaps this is intended behaviour instead of a bug?