This must be like a 1 in a million bug or something because I have never seen it before, but I instamined a dirt block with a torch on it and for some reason the light from the torch that was in a chunk other than the torch didn't update properly
I don't think this is the same bug as MC-172980 because it happened without commands and that bug only happens when placing or removing 64 light sources in a chunk at a time. I experienced mine in survival mode. And looking at the screenshots of that bug it looks nothing like my experience (the lighting is smooth in mine where it sharply cuts off at the borders in MC-172980)
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Duplicate of MC-172980.

The description of that bug is not the same as this bug. That bug is caused by /fill ing large amounts of light sources at a time caused by some sort of overflow to the updates. and also it looks like the light didn't cross the borders at all and made sharp changes in lighting where here the light properly crossed the chunk border, it just didn't realise the torch was removed in the adjacent chunk and the lighting seeped back into the original chunk.

I will update the description accordingly.

Are you sure these are the same? If you look, the light is dimmer than a regular torch, but the light still crosses the chunk border, it's just dimmer. It's like there's a ghost light source or something
Sorry I'm not trying to be rude but these really don't look like the same thing to me.

At this point, MC-172980 is more of a catch-all ticket for all block lighting updates that do not propagate properly across chunk borders. The fact that the lighting propagates back to the original chunk is expected if the wrong chunk is updated first (something which I've experienced before while testing MC-166260 and MC-172980).

Ahh ok. Thank you for updating the other report too