When I use the f3+t shortcut to refresh textures, the gamemode switcher (f3+f4) has a seemingly random texture each time. The dragon head item and the ender dragon share the same random texture. I have also noticed that when the escape key is pressed, every block texture sometimes changes to different colors. I haven't been able to recreate the texture change when pressing the escape key, but I have found some very strange things happen with it that I wasn't able to record.