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PNG files exif metadata is not shown
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Description

PNG images uploaded to Wikimedia Commons do not have their EXIF data parsed.

EXIF is part of the PNG standard, at least since Extensions to the PNG 1.2 Specification, Version 1.5.0

Example file for which metadata is not shown: https://commons.wikimedia.org/wiki/File:Square_Marie-Louise_(DSCF7298).png. Some tags are there but none of the typical {Exposure time, F-number, ISO speed rating, Date and time of data generation, Lens focal length, software used, ...}. I've attached the output of exiftool on that image: