Even though I expect you have installed Java 17 on your system the game is still beign ran with Java 8. Do note that the Minecraft launcher will now not allow you to use Java 16/17 with Minecraft 1.16 ...

After an amount of time, the world reloads all textures and doesn't reload properly, leaving the world semi-transparent. I expect that this wasn't intended at all? It's also present in the two prior ...