Wrong Img-Height when using 'img-fluid' inside a card

Created by: PoisonSin

When you use an image with class 'img-fluid' within a 'card', the width is correct but the height is the original height of the image.

This happens because the card has now the style 'display: flex'. If i style the card with 'display: block' everthing works fine!

Bootstrap 4 Alpha 6

Chrome + Firefox OK! IE 11 = bug