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amp-embed can become stuck in the loading state after an amp-consent choice is made

See original GitHub issue

What’s the issue?

An amp-embed element behind a data-block-on-consent attribute can fail to load following a choice being made in amp-consent. The element will hang with the spinning icon and no iframe is inserted into amp-embed element.

On occasion when this happens it will affect all elements behind data-block-on-consent including amp-ad.

It happens most often with amp-embed and was seen on the Google CDN by a client. When it does happen the affected elements are left in a perpetual loading state.

In the instances where only amp-embed is affected we can see that amp-consent correctly passes on the consent details as we can see the consent string value in DFP calls for amp-ad elements.

Here is a video using iOS simulator that displays the issue with just the amp-embed failing after making a consent choice.

Note that this only happens on the first visit as a new user, once refreshed everything works as expected and that we see no issues with amp-embed loading.

How do we reproduce the issue?

The original internal reporter spotted it on the Google CDN but as a team we haven’t been able to recreate it by happenstance. We can however recreate it on occasion using a private/incognito tab on an iOS device.

https://www.google.com/amp/s/www.dailymail.co.uk/sport/football/article-9110445/amp/William-Saliba-set-join-Nice-loan-end-season.html

Visit the above article on the Google CDN in iOS safari with a new incognito/private tab. You’ll need to be using an EU connection for amp-consent
Hit the the green Got it button.
Once the overlay has disappeared scroll down to the end of the article after the social sharing bar and comments block to the taboola amp-embed.
Note on occasion that the amp-embed will just hang with the amp loading icon.