Light from a source block stays bright after destroyed with magma blocks close by.

I was testing out the new blocks in the snapshot in creative mode and I found that when I placed down a sea lantern next to some magma blocks and then destroyed the sea lantern, the light from the sea lantern would stay as if the sea lantern was still there and would not go away until all the magma blocks are removed/destroyed close to it. I have not tried any other light sources yet.