Buttons light and stable have no border

I checked the ionic button Stable and Light and they do not have border.

The class i use

class="button button-block button-light"

The ionic css

.button.button-light {
    border-color: transparent;
    background-color: #fff;
    color: #444;

Same for button-stable

Why are the border-color transparent?

If i look at the ionic components buttons have border but not mine.
Ionic components button

Hello, i upgraded my ionic and i also lost the borders on my buttons! did you found a solution ?