This is an issue on Linux too, especially when Wayland is used and applications are responsible for drawing their own chrome. Ugh.

HOWEVER, due to the open nature of the platform, you can install an extension to clean this up. Now, all my windows have identical corner radii, strokes, shadows etc. My Linux desktop is, surprisingly, more consistent now than macOS in this regard.

https://extensions.gnome.org/extension/7048/rounded-window-c...