Set InitialOpacity to 1.0 for copy button
MODIFY
WalletWasabi.Fluent/Views/Wallets/Receive/ReceiveAddressesView.axaml
WalletWasabi.Fluent/Views/Wallets/Receive/ReceiveAddressesView.axaml
ToolTip.Tip="Copy"
Command="{Binding CopyAddressCommand}"
NormalIcon="{StaticResource copy_regular}"
- ClickIcon="{StaticResource copy_confirmed}"/>
+ ClickIcon="{StaticResource copy_confirmed}"
+ InitialOpacity="1.0"/>
<TextBlock Text="{Binding Address}" />
</DockPanel>
</DataTemplate>

Set InitialOpacity to 1.0 for copy button