Each height settings will be disregarded (ver 3.3)

I don’t know what kind of issues are resolved with ver 3.3, but following style is added:

.fancybox-content {
    height: auto!important;
}

So many settings of ‘height added tofancybox-content` will be disregarded.
It seems that images are not at the center, but grab to the top (bottom padding is greater than top padding).

Especially, fixed size link-as-a-frame popup will not be displayed because its height will be 0.

I’m using following to display own schedule calendar as pop-up:

<a data-fancybox data-type="iframe" data-options='{"iframe" : {"css" : {"width" : "320px", "height" : "380px"}}}' href="/schedule/">Schedule</a>

It worked as expected with past version, but not with v3.3.
Is it possible to narrow down the context of height: auto!important;?
or it is hard to override !important setting for each my usage.