When using dark tinted app icons, the Bear icon is hard to recognize. If the bear part of the icon was red and not white, it would be easier to notice. It’s odd that it isn’t, because all of Bear’s other app icon options retain their color in the bear shape when tinted dark.
The one icon that it would make the most sense to keep the color, as far as app recognition (the Bear-branded red), for some reason goes white, making it a black and white icon.