Skylight underground after updating/breaking light producing blocks

Sometimes: when broken, the torch disappears but the light source stays. However, the light level is lowers. When a torch is placed back on the same spot, the glitch will always happen after breaking the torch again. If a block is placed or the block next to it is destroyed, the light goes away.
This is was recreated several times, even after exiting the game and coming back.

More testing in the comments