Currently the PhotoSwipe field formatter omits the item_attributes variable in photoswipe_image_formatter.
Unfortunately, lack of item_attributes variable blocks third-party modules to modify the item attributes.
Following patch restores the variable.
Closed: won't fix
5.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
New features go into 5.x - @Grevil what do you think make sense here? Should we proceed or close it won't fix? No community activity since~1Y ...