Block textures appear when toggling fullscreen (F11)

When full screening either with WIN + SHIFT + ENTER or F11, the screen flickers red black (was red in previous 1.17 versions with the white loading screen).

 

There is also a seemingly random chance that a random block texture will appear: https://imgur.com/7WdzXko

 

The image above was taken the exact moment I fullscreened.