I was trying to connect to Hypixel, and missclicked, and joined another Server (GommeHD). I somehow managed to click the cancel button right after I joined, and with that I mean there probably wasn't even 50 miliseconds inbetween. So I joined Hypixel, and I started to notice that the tooltip was flashing between the one from Hypixel, and the one from GommeHD. After a while, when I started playing Skyblock, I saw that the time was flashing to, from the dark sky (it was night in skyblock) to the day sky from GommeHD. I tried joining GommeHD, but it said that I was already in the network. So I restarted my game, and everything worked perfectly fine. I used Optifine 1.16.1 for this, but I don't think it matters.

I could not set the Version that this affects to Optifine 1.16.1 or 1.16.1.