Water blackout when swimming at night occasionally

I am playing with my sister in Survival and I go to swim in water to kill fish and find Drowned. When I do that at night, the water blacks out occasionally. This is not always the case. I am player 2 and it doesn't affect player 1.

How to reproduce:

1. Make sure it is night.
2. Go swimming in any body of water at least 2 blocks deep.