[NET 10, iOS 26] Liquid glass hamburger and toolbar icon flashing

Description

When the Shell BackgroundColor isn't white, the liquid glass buttons in the top bar flicker white before reverting to the anticipated appearance (albeit with poor text colour).

https://github.com/user-attachments/assets/d538da4a-e25e-4179-a5c6-7c6c584771e8

Steps to Reproduce

1. Create a new MAUI project
2. Update the shell so that the app has two bottom tabs.
3. Give the shell a background color (e.g. red)
4. Navigate between both tabs, observe the flash from white glass bubble to the expected color (e.g. red)

Link to public reproduction project repository

https://github.com/Rover656/Maui-Liquid-Glass-Flashing

Version with bug

10.0.10

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

iOS 26.0.1, built with XCode 26.0.1

The appearance looks less extreme when tested on a physical iOS 26.1 device where the colour shift is more of a brief period where the widgets shift in transparency - so very likely this is a 26.0 specific issue.

Did you find any workaround?

No response

Relevant log output

Start with the linked public reproduction project and reproduce the Shell tab navigation on iOS 26.0.1 with a non-white Shell BackgroundColor. Compare the behavior on the simulator and physical iOS 26.1 device, then trace the Shell top-bar hamburger and toolbar icon rendering; done means navigation no longer causes a white flash or transparency shift before the expected appearance.