I was working in Pre release for 1.13 Pre 2, I was testing an Automatic Potato Farm that uses Light Level 7 on one block to function. But when I check the Light levels in the build they all read as 0 Sky 0. the Farm is 15x15 with Glowstone at each corner and in the middle of the Edges as well as 4 in the middle 4 blocks above and one in the center at 7 above with an opaic block below it 4 blocks above the dirt.
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I created this world in the snapshot after the world generation bug was fixed and have been testing the updates. I dont recall the update number.
so the only real updates have been to Pre release one and two

sorry the listed case is not the same the case you listed is light is passing thru but my levels a 0
What version was this world created in?
What version(s) has this world been upgraded to in the past?