`requestFullscreen()` doesn't work after YouTube video played full screen

[accuser]

I've used fscreen in a Svelte component to wrap content (e.g., <img />) so that a user can zoom in and out of full screen. I've added a YouTube video to the page (via an iFrame, with allowfullscreen, not wrapped by my component) but once the video has entered and exited full screen mode, the images can no longer be zoomed to full screen, i.e., requestFullscreen() does nothing.

Is there anything that I need to do to make this work?