What did you do?
- NavigationBar has its own color, which is different from colors.background (white).
- Using makeChannelHeaderViewModifier of DefaultViewFactory.
- Go to a chat screen from the list chat channel.
What did you expect to happen?
The channel avatar view should show correctly like this:

What happened instead?
A circle button, which is filled colors.background, is visible beneath ChannelAvatarView in ChatChannelView:

Fix:
Configure style for button in ToolbarItem, which automates adding padding for Button, it seems like a bug of SwiftUI.
-> Add this line .buttonStyle(.plain) to here like this:

GetStream Environment
GetStream Chat version: 4.66.0
GetStream Chat frameworks: StreamChat, StreamChatSwiftUI
iOS version: iOS 17, iOS 18
Swift version: 5.5
Xcode version: 16.2
Device: both device + simulator
Additional context
Condition to reproduce: NavigationBar has its own color, which is different from colors.background (white).