Problem with video height since 4.9

[vhcrossmedia]

I have a video on a page and after updating to WP 4.9.1 the following element gets a height of 0px:
<div style="width: 822px; height: 0px;" class="wp-video" data-aspectratio="0">

The result is that the video area shows just the controls and nothing more (see attached screenshot on the left) .

I can fix this with workarounds via CSS like styling mejs-container and mejs-mediaelement (see attached screenshot on the rigth) but that's a hassle for the responsive versions.

Anyone elese facing these problems?

(P.S.: I'm not an expert AND a German, so forgive me for dumb questions and bad writing …)

[programmin]

There is a similar ticket on how Wordpress now removes the height= attribute from iframe tags in the textwidget, it causes the iframes to have no height= in the final html and it is too short. Could that be what you're seeing?

https://core.trac.wordpress.org/ticket/42695