[Bug] [iOS] ToolbarItem Secondary icons not scaled

Description

On UWP adding an icon to a secondary ToolbarItem scales it propertly. On Android the icon doesn't render at all. On iOS the icon renders but it is not properly scaled to fit.

Example XAML

<ContentPage.ToolbarItems>
    <ToolbarItem Order="Primary" Text="Icon Item" Priority="0" IconImageSource="icon.png" Clicked="OnItemClicked" />
    <ToolbarItem Order="Primary" Text="Text Item" Priority="1" Clicked="OnItemClicked" />
    <ToolbarItem Order="Secondary" Text="Secondary Icon Item" Priority="2" IconImageSource="icon.png" Clicked="OnItemClicked" />
    <ToolbarItem Order="Secondary" Text="Secondary Text Item" Priority="3" Clicked="OnItemClicked" />
</ContentPage.ToolbarItems>

Screenshots

Android:

UWP:

iOS:

Steps to Reproduce

1. Add an icon to all projects
2. Create secondary toolbar item with icon as shown in above XAML
3. Observe icon behavior on iOS

Expected Behavior

Icon should either not render at all, like Android, or should scale to fit, like UWP.

Actual Behavior

Icon overflows the boundaries of the text item.

Basic Information

• Version with issue: 4.1.0.555618
• Last known good version: Unknown
• IDE: Visual Studio 2019 (PC)
• Platform Target Frameworks:
  • iOS: 8.0
  • Android: N/A
  • UWP: N/A
• Nuget Packages: Xamarin.Forms
• Affected Devices: iOS