Atomic: error when adding menu items in Customizer with VideoPress header

[lancewillett]

On Atomic sites in Customizer — using the Twenty Seventeen theme, for example — with the VideoPress video header feature in Customize > Header Media it's not possible to add more items to the menu.

Looks like a JavaScript error blocks the action.

Steps to reproduce

1. Atomic site, make sure VideoPress is active in Jetpack
2. Activate Twenty Seventeen
3. Go to Customize > Header Media, add video to header
4. Save and reload customizer (not sure if this is necessary)
5. Try to add items to the Menu from the Customizer

What I expected

Menu editor would work as normal to add items.

What happened instead

The sections (eg Pages, Posts, Categories) will not open to allow you to add new menu items.

Screenshot / Video

https://user-images.githubusercontent.com/1398304/110544861-3f202400-80e1-11eb-9c25-e106ce33df1e.mov

JavaScript error:

Context / Source

User report/follow-up: ​2768458-zen

Reported by @kristarella in Trac: 8200-wpcom

[ccwalburn]

Another report for a site using the Ovation theme here: 3038003-zen

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[obenland]

Based on the JS error in the screenshot this seems to be a bug with the cookie banner widget. I wonder if it just didn't mount in the customizer, causing the error and https://github.com/Automattic/jetpack/pull/16927 fixed that.

@kristarella I've not been able to reproduce the bug based in the steps in the ticket description. Would you mind testing again and see if https://github.com/Automattic/jetpack/pull/16927 fixed it?