GM loses transparency on some grayscale PNG images?

Shane Bishop <[email protected]> Wed, 18 Sep 2019 06:50:48 -0600
Newsgroups gmane.comp.video.graphicsmagick.help
Message-ID <CAOSZYLjooh72FewPY_2awjW1WRpoETmpvR5Ny_1AY8wc024vAg@mail.gmail.com>
Hi,
I was checking the WordPress Photon changelog and stumbled across this
tidbit:
https://code.trac.wordpress.org/changeset/488

We use a fork of their API in one of our products, and so I was curious to
find out more, and see if perhaps the bug had been reported to GM, but
couldn't find anything online about it (and they've removed the 2 linked
issues).
Any idea what this is about? Is it a known issue, or was it fixed at some
point recently?

Thanks,
Shane

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