Lightbox gallery always show first image.

[milindmore22]

Bug Description

If a page/post has multiple images and all images are opted-in for AMP Lightbox, clicking on any image shows/focus the first image on the page.

Expected Behaviour

The clicked image should be opened up/focused in the lightbox gallery.

Steps to reproduce

1. Create a Post
2. Add 3-4 images and Opt-in for Lightbox
3. Open Same Post's AMP endpoint
4. Scroll down and click 2nd, 3rd, or 4th image
5. The first Image shows up.

Screenshots

https://recordit.co/bIdEHsi0gI

Additional context

• WordPress version: 5.8
• Plugin version: 2.1.3
• Gutenberg plugin version (if applicable): not active
• AMP plugin template mode: Transitional Mode
• PHP version: 7.4
• OS: Mac OS Catlina
• Browser: Chrome
• Device: MacBook Air

Test URL (it will last for 6 days ): https://particular-copperhead.jurassic.ninja/2021/07/26/image-test-gutenberg-deactivated/amp/

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Acceptance criteria

Implementation brief

QA testing instructions

Demo

Changelog entry

[westonruter]

It looks like this may be an issue with AMP core. See ampproject/amphtml#35402.

[westonruter]

Nevertheless, I don't think the workaround described in ampproject/amphtml#35402 (comment) will work in the plugin because the unused amp-carousel script would get stripped out.

[milindmore22]

Closing this as it's fixed in upstream ampproject/amphtml#36103 and we are no longer able to reproduce the bug.