I’d previously built a custom search results page, and was displaying the permalink in the result. However, after updating to 4.3.1, (and WP 5.7), that text is now being rendered as an iframe in the search results.
I assume some WP embedding behavior changed recently? I’m just using the DC for permalink in a vanilla text field.
BTW, all dropdowns and off canvas elements on that SERP also stopped working… not sure if it’s related.
In the secure note, I shared a link to a staging site, where you can see both the issue with the iFrames as well as the dropdowns. The global nav has a number of dropdowns, and if you switch to any other page, you’ll see they work fine. 
Hi @devinelston,
I’m sorry about that. Confirmed. It’s the WP Auto embed, but it shouldn’t be running that late. It should run prior to Dynamic Content. We’ll get that fixed for the next point release.
I haven’t looked in-depth at the issue with the toggles but that error would happen if there is a “toggleable” that doesn’t have a corresponding toggle somewhere else in the DOM. I’ll make an adjustment to prevent that from causing a fatal JS error.
