I was playing as one of my characters in game (Luan Loud from The Loud House) but something weird happens. When she touches her head in the water but not completely underwater, her head goes invisible and when she was completely underwater, her head was back.
My character outside water:
My character not completely underwater and her head goes invisible:
My character completely underwater:
I checked the preset material (preset_1.material) for the character but there's nothing wrong.
Problem solved: I turned off the water reflections and it worked, that means my characters’ body parts won’t go missing when not completely underwater.