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Using CKEditor, Picture & Breakpoints (for responsive images)
Images in Body fields will correctly show captions unless the IMG has the "data-picture-group" attribute (which is added by Picture), then the captions don't show up.
Manually removing that attribute (using CKEditor in plaintext) fixes the captions, while breaking responsive functionality.
Presume the processing done by Picture and by Image Caption are walking over each other...