Description
amp-lightbox-gallery when clicked on any picture starts showing always the first one. That affects UX because users want to watch a picture on fullscreen mode but clicking there they should find their picture again expending time and losing interest.
Reproduction Steps
first picture:

last picture:

last picture clicked and the first pictures showed:

Relevant Logs
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Browser(s) Affected
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OS(s) Affected
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Device(s) Affected
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AMP Version Affected
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