when I logged on to hypixel and cubecraft some textures turned black and when I logged on to mineplex and bedwars practice, everything was fine. This bug only works on multiplayer servers and not on singleplayer worlds. I deleted minecraft launcher and the all the game files.

and reinstalled them freshly. but still the bug was present in the game.

how to reproduce:

step 1: open minecraft

step 2: log on to hypixel or cubecraft

then you will notice that some textures have turned black

step 3: log on to mineplex or bedwars practice

then you will notice that the textures are normal.