We have an issue with h5p-image-juxtaposition object type when action bar is missed.
Iframe is not properly resized and has 0px height. Only window resize helps. Here is a screencast https://take.ms/Ur6pd.
It works fine when action bar is enabled.
Also it could be useful information: On our courses content is rendered after DOM is ready, but calling $(window).trigger('resize') doesn't help.