Yep, sorry I hadn't seen it before posting... :/
It's the same problem as that one
Im sure it could of corrupted, I'm just not sure how this is possible, I've also never had this happen before so I don't know how
Is that a joke?
I've tried to recreate this by making a new world, and making a big lime concrete box, roughly the size of this one, it is covered by 3 sides. It still creates lag for me, my computer might hit 110 fps
[media]when I'm in the air flying, or maybe walking on the ground a little, then it goes to 70-80 fps and stays around there for a while, and then loops again. I added exactly 216 light blocks and it still lags my computer, here is a screenshot of what it looks like in the new 1.17.1 world
I forgot about that, next time it happens I'll take my texture pack off and see it does that
Yeah, this bug hasn't been fixed, it still occurs in 1.19.3, the most recent update (at least for chain command blocks)