First rendering display the hidden face for a short amount of time

[tiaaaa123]

Hi,
I'm using this component to make like a deck with cards and on the first render, it render both face one over the other. The problem I have is that the face up of the card is an Image, until it renders it, we can see the bottom face. Not for a long time, but it's like a flash (bottom card is white on a black background, so it's quite visible)

Shouldn't the component render only 1 of both child at the time and halfway throw the animation it render the second child. It would create the illusion of having 2 side, but only one is rendered?

Thanks