YouTube embeds using /watch URLs broken on V3.2.1

[steven-honcho]

After upgrading from 3.1.6 -> 3.2.1, any YouTube embeds we had seemed to be broken - but unusually only on 'live' environments, local DDEV seemed fine.

Locally, on 3.2.1, the TWIG .render method would output the following:
<iframe width=&quot;200&quot; height=&quot;113&quot; src=&quot;https://www.youtube.com/embed/_HWRGKfSq3A?enablejsapi=1&amp;feature=oembed&quot; frameborder=&quot;0&quot; allow=&quot;accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share&quot; referrerpolicy=&quot;strict-origin-when-cross-origin&quot; allowfullscreen=&quot;&quot; title=&quot;Jose Gonzalez - Stay Alive | The Secret Life of Walter Mitty&quot;></iframe>

Whereas on our staging environment, with the same video URL, it'd output the following:
<iframe src=&quot;https://www.youtube.com/watch?enablejsapi=1&amp;v=_HWRGKfSq3A&quot;></iframe>

Both were using the exact same URL:
https://www.youtube.com/watch?v=_HWRGKfSq3A

Aside from the frontend being broken, the video preview under fields using URLs in this format also seemed broken (loading the entire YouTube page rather than just the video).

Downgrading to 3.1.6 seems to fix the issue, both frontend and in the CMS.

[reganlawton]

@steven-honcho do you have cache turned on? If so maybe flush your cache and turn it off and regenerate the pages before turning back on. Definitely a weird one as you said, it was working locally, but then when you deploy it out, you'll get into issues. Your local one is actually rendering the plugin correctly, whereas your staging one is actually using a fallback. I would also potentially look at logs to see if there's anything going on. A bit of extra information might be good for me to direct you to next steps

[abshreve]

Having the exact same issue.