Already reported, almost the same: https://gitlab.gnome.org/GNOME/gimp/-/issues/7824
I remember this coming up before and it is a peculiarity of Gimp 2.10, not there in Gimp 2.8 An extra index0 added on import.
edit: A bit of experiment with IM identify.
Even with all the export options off, the extra color (index0) appears in a Gimp 2.8 png using IM. Just does not appear in the Gimp 2.8 colormap. How to explain that to the devs ?
I remember this coming up before and it is a peculiarity of Gimp 2.10, not there in Gimp 2.8 An extra index0 added on import.
edit: A bit of experiment with IM identify.
Even with all the export options off, the extra color (index0) appears in a Gimp 2.8 png using IM. Just does not appear in the Gimp 2.8 colormap. How to explain that to the devs ?