Since a couple of weeks ago, Auto Dark Mode for Web Contents set to “Enabled with selective inversion of non-image elements” is inversing smaller images (like 300x300px or below).
Same issue if that option is set to “Enabled” or “Enabled with selective image inversion based on transparency and number of colors”
I can’t find that setting in Brave. If this is this in an extension, you should report the issue to the developers. Most extensions have a Support Hub linked from their page on the Chrome Web Store.
If it’s in Brave, can you post the address of the section of the settings page?
@Mythical5th it’s a flag under brave://flags. Well, a Chromium flag that’s available there. You can see it in chrome://flags on Chrome and all as well.