A couple of days ago I went AFK at my phantom farm and was waiting for "Time Since Last Rest" to reach 1 hr. With full-screen off, I opened my inventory and minimized the window so I could have MC running in the background. When I expanded the window again the moon looked like a segment of my inventory. In the two days since I've seen it as the inventory screen, Part of the wandering trader's robe, part of the desert villager's robe, and a big white rectangle. This issue with the moon has affected both my survival world and my redstone testing world.
Just today I opened my testing world and found some odd rendering of the desert villagers, the faces and profession identifiers of the villagers (such as the fisherman's hat and the string on his belt) appeared normally, but their base robes were rendered a solid white, however the plains villagers in my survival world are rendering fine as of the time of me writing this.
I've ran 1.17 from June 8th-July 2nd with no moon issues, and June 8th- the morning of July 4th with no desert villager issues. I installed Vanilla Tweaks some 1.17 resource pacls a few days after the release of 1.17 and have run it with no issues. I've also gone AFK with the screen minimized before with no issues. This might be a user error somehow, though I'm at a loss as to how I would fix it.
Below are a few screenshots I took that I hope will help illustrate the issue at hand.