Hello there, i was excited to try out the Beta (1.17.0.52), and while i was playing, i died due a visual bug, this bugs appeared at Y:-52, there was a lava pool (natural generation), the first layer of lava is invisible, so how did i noticed there are invis lava?, well, there was stone under lava (but i didnt knew it was lava because it is invisible...) and i was walking and i started burning and get lava damage, also i became slow (because lava), so i went on creative and yes, the air was burning me, but was the air, so i say it was invisible lava, and also it has the same properties that lava, but it was not the only bug, has i said, the first layer was invis, but the second and the others was not, so it was weird, only the first layer of lava made light, but the others not, and then you can see lava that doesnt make light and also lava affected by shadows, yeah, shadows in the lava

I hope i explained this bug well, my english isnt of all good, there are 3 images to explain the bug, in one it shows im burning, in another one the shadows and the anothe another one it shows there are lava particles in middle of the nothing

Maybe it could help:

Seed: 1633292409

Coords: -48 -53 -49

I hope my report may be helpful

Bye!