When the player views an Invisible entity thats in front of water the water does not render.

How To Re-Create:

summon an entity: /summon iron_golem ~ ~ ~ {NoAI:1b}

give it the invisibility potion effect: /effect give @e[type=iron_golem,limit=1,sort=nearest] invisibility 50 1 true

then go into spectator mode: /gamemode spectator @s