Lighting sometimes ceases to exist

Hello there!

So, I've converted my Infdev world (previously converted to 1.17.1) and in some places lighting just stops. When it's daytime, there are some black spots in which lighting doesn't work and the mobs can spawn there. The black spot just ignores that nothing is above it, it's just pure air. The "black hole" as I would like to call it exists to a particular Y level like 110 (shown in the video below). I've even experienced the same issue in a newly generated 1.18 world. And now I'm afraid that I accidentaly broke my main world while converting it to 1.18 (glad that backups are a thing). Like, why does it even exist ? The lighting system didn't change. Maybe you know what causes this bug ? Also, the new caves don't generate under the Infdev chunks for some reason (maybe it's because caves didn't generate in the tested Infdev version)? And another thing. It seems that the issue is not consistant, because the lighting error disappeared after relaunching the world.

Have a nice day everyone 🙂