Lightbox sidebar missing for Embeds, Videos and Audio media types

The lightbox sidebar is missing for embed, video and audio media types. This is happening with XFMG 2.3.2 and here on XenForo.com at the time of posting. The sidebar does correctly display for images.

Upon checking the browser console, an uncaught TypeError is logged for the XF2.3 lightbox (in the case of embeds, videos and audio):
JavaScript:

Uncaught TypeError: b.contentEl is undefined
    onSlideDisplayed https://xenforo.com/community/js/xf/lightbox-compiled.js?_v=f87c062b:15
    trigger...

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