Closing as Won't Fix. The issue is only visible if a dialog is taller than the screen's height, which is not a good design practice in the first place. Dialogs, in general, are a convenient way to show a small amount of information or input quickly, without having to load a new page. For bigger amounts of content, it's better to simply use a new page. The issue itself occurs because the 'hidden' CSS class of the dialog uses the styling 'visibility: hidden;' instead of 'display:none;'. However, it is necessary for the dialog to not have the 'display:none;' styling when hidden, because, otherwise, the dialog wouldn't be rendered properly when made visible.
Bug
Major
Closing as Won't Fix. The issue is only visible if a dialog is taller than the screen's height, which is not a good design practice in the first place. Dialogs, in general, are a convenient way to show a small amount of information or input quickly, without having to load a new page. For bigger amounts of content, it's better to simply use a new page. The issue itself occurs because the 'hidden' CSS class of the dialog uses the styling 'visibility: hidden;' instead of 'display:none;'. However, it is necessary for the dialog to not have the 'display:none;' styling when hidden, because, otherwise, the dialog wouldn't be rendered properly when made visible.