In-game, I was outside the house that I built in Minecraft, while creating a line of torches to make sure that I did not forget it, the rain began. But it was not an ordinary rain like what happened in the older version. As I go further, the rain somehow only occurred on one side while on the other side, it remains clear. I have nothing else to say but the picture that I'm showing you is a rare bug, only a few Minecraft worlds may have such a strange effect as this.

Note: This effect may also happen in 1.20.1 version or over