Even if users disable the popular Lazy Load for Videos plugin and the frontend correctly resets videos so that videos are no longer lazy-loaded, the Gutenberg block does not get reset. Below screenshot shows how the iframe still includes the HTML of the deactivated plugin:

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I cleared my browser cache and cookies, I ensured the oembed metadata caches are emptied, and I tried to clear more caches using commands from How can I clear oEmbed caches for YouTube on posts as they are loaded.

How can I ensure that the old HTML disappears in favor of the default Youtube embed behavior?

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