Conflict with embedded WordPress posts

[stefanbohacek]

Reported by https://masto.ai/@cybeardjm.

Steps to reproduce:

1 - embed a WP post (copy/paste URL)
2 - save draft / preview => the embed is here
3 - embed a Mastodon post (using embed code in "custom HTML" block) => in Edit mode, both are visible
4 - save draft / preview => the Mastodon embed is fine, styled with the embed plugin, BUT the WP embed is now only a link to the post.

[stefanbohacek]

This was fixed with b3be62e and b6ea5d2, but the issue is still present when the Classic Editor plugin is enabled.