Full screen mode not working in YouTube while using Glance mode

Preliminary Checks

• I have read and understood the important section above.
• I have searched existing issues and avoided creating duplicates.
• I am not filing an enhancement request.
• I have checked that this issue cannot be reproduced on Mozilla Firefox.
• I have checked that this issue can be reproduced once I removed all my Mods and Custom CSS.

What happened?

When using the "Glance" feature in Zen Browser to open a YouTube link, the full-screen button on the YouTube player does not function. It fails to expand the video to fill the screen or the glance window properly.

Expected behavior

The YouTube video should enter full-screen mode (within the Glance window or the entire screen) when the full-screen icon is clicked.

Actual behavior

Clicking the full-screen button does nothing, or the video remains windowed inside the Glance overlay.

Steps to reproduce

1. Open Zen Browser.
2. Open any website and use the "Glance" feature to open a YouTube video link (or use the shortcut to open a link in Glance).
3. Try to click the "Full Screen" icon on the YouTube player.
4. Observe that the video does not expand.

Screenshots and videos

Version

1.17.15b

What platform are you seeing the problem on?

Linux (Tarball)

What component is this issue related to?

Glance

Relevant log output if applicable