
As you can see, the Keepass icon no longer respects the system theme and looks vastly different in comparison to other icons. Before 2.6, the icon was monochrome like all the other icons. With 2.6, the icon now doesn't respect the icon theme anymore.
Just select the monochrome dark icon from the application settings
"No longer"
It has never done that. If anything, your distribution forced a different icon, which we do not allow anymore.