On latest snapshot currently (1.14.1 Pre 2), on a server, my base i've found that what triggers the lighting glitch is loading the world via nether portal entrance, if i run away/come back after fixing chunks, it's fine, but after using a nether portal, then coming back through it the light glitches horrifically then in a chunk by chunk basis, always the same chunks, and pertains the glitch until updated, although they will revert on portal exit again.
Hope this helps for recreating it!
had this issue happen to me too.