since  the last update for the beta there have been several blocks that have stopped emitting light (most actually). I have tested every light source block that I could (could not figure out how to get end gateway without going through trouble of killing ender dragon) and only 6 of the blocks produced light. these blocks are:

torch, soul torch, redstone torch, lantern, soul lantern, end rod.

all other light emitting blocks did not produce light. these include:

glowstone, redstone lamp, sea lantern, sea pickle (all 4 intensities), shroomlight, lava source blocks, flowing lava, campfire, soul campfire, beacon, fire, soul fire, cauldron containing lava, conduit, jack o lantern, respawn anchor (any charge), blast furnace when lit, furnace when lit, smoker when lit, enchanting table, crying obsidian, redstone ore when touched, ender chest, blue ice, magma block, brewing stand, brown mushroom, nether portal block, end portal block, end portal frame, dragon egg.