Hello, today I was trying to create an effect that when a player would go underwater, it would give them blindness and night vision in order to create the complete blindndess effect. The commands worked but there was a graphical error on the screen, like if something was overlapping. Later, I tried giving myself the effects with the /effect give command and the result was the same. I tried to make screenshots but on the image appears black.

The steps to recreate the bug are:

1. Give yourself blindness
2. Give yourself night vision
3. Go inside water

I hope this helped!