I set up a village to be well lit to avoid mob spawning. While walking around there were many areas where mobs could spawn, the block lighting was zero even when I was right on top of a torch. When I broke and replaced a torch the block lighting went back to 13-15 as it was before and mobs stopped spawning in that area.
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j'ai rencontré le même problème
I have same problem. Torch that was in game before update don't light as they should. if i remove one and put a new torch in same place it light good.

I Had same problem.
My world was used in beta 1.14. the bug was in beta.
when the 1.14 come released the bug stay with this world.
I maded a backup before updating in beta 1.14 (it was 1.13 release) and reload this. then when i launch this 1.13 world and update it to 1.4 release it is OK, the bug diseapear