# YouTube URIs fail to render thumbnails when oneboxed

**URL:** https://meta.discourse.org/t/youtube-uris-fail-to-render-thumbnails-when-oneboxed/387673
**Category:** Bug
**Tags:** composer, onebox
**Created:** [November 5, 2025, 2:07pm UTC](https://meta.discourse.org/t/youtube-uris-fail-to-render-thumbnails-when-oneboxed/387673 "2025-11-05T14:07:47Z")
**Posts on this page:** 1
**Showing post:** 1

<div class="post-metadata">

### Author: ![roke\_julian\_lockhart](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/roke_julian_lockhart/32/540179_2.png) [@roke\_julian\_lockhart](https://meta.discourse.org/u/roke_julian_lockhart)
#### Post date: [November 5, 2025, 2:07pm UTC](https://meta.discourse.org/t/youtube-uris-fail-to-render-thumbnails-when-oneboxed/387673/1 "2025-11-05T14:07:47Z")

</div>

I’ve confirmed that:

1. [`https://youtube.com/shorts/Cs3sTnLO6EE`](https://youtube.com/shorts/Cs3sTnLO6EE)

2. [`https://www.youtube.com/watch?v=Cs3sTnLO6EE&lc=Ugyi1VtrCVd2POTc82N4AaABAg#:~:text=A%20Screencast%20Of%20LinkedIn%20Persona%20Verification%20Failure`](https://www.youtube.com/watch?v=Cs3sTnLO6EE&lc=Ugyi1VtrCVd2POTc82N4AaABAg#:~:text=A%20Screencast%20Of%20LinkedIn%20Persona%20Verification%20Failure)

…become a transparent box:

| Shorts | Non-Shorts |
| --- | --- |
| ![](https://global.discourse-cdn.com/meta/original/4X/1/1/b/11b7761c52d8adb2884470645e6331817e0f4c66.png) \[1\] | ![](https://global.discourse-cdn.com/meta/original/4X/3/8/2/382e5ade2a49f0bf1e28c78ae8d438fc5e409f2c.png) \[1:1\] |

The DOM shows:

> ```HTML
> <img src="" width="480" height="360" title=" - YouTube" style="aspect-ratio: 480 / 360;">
> 
> ```

However, they render when posted:

[![](https://global.discourse-cdn.com/meta/original/4X/b/a/9/ba9df0af3ceaae483889955f1d6b969dabe5c8c8.jpeg "A Screencast Of LinkedIn Persona Verification Failure") ](https://www.youtube.com/watch?v=Cs3sTnLO6EE)

* * *

1. [`bugs.kde.org/show_bug.cgi?id=511477#c1`](https://bugs.kde.org/show_bug.cgi?id=511477#c1:~:text=2025%2D11%2D03%2021:06:27%20GMT-,Duplicates%20https://bugs.kde.org/show_bug.cgi?id=510982%23c2.,-***%20This%20bug)

---

_[View the full topic](https://meta.discourse.org/t/youtube-uris-fail-to-render-thumbnails-when-oneboxed/387673)._