Page specific ResourceDictionary crashes the app on iOS and Android, and not working on Windows

[dhindrik]

Description

When having a ResourceDictionary in a page with for example double values and you use them in the page it will crash the app on iOS and Android. On Windows elements where I set HeightRequest="{StaticResource MyHeightValue}" will not show up.

This only happens in Release, in Debug it works. ANd for iOS and Android I have only tested on physical devices.

On iOS i found this error message when I open the console via XCode: MainPage.InitializeComponent: Store local stack type mismatch 3 4

It worked fine with .NET 8. We found this problem when testing our app after updating to .NET 9.

Steps to Reproduce

1. Create a new .NET MAUI app
2. Add a ResourceDictionary in the MainPage.xaml
3. Add a double value to the ResourceDictionary
4. Use the value as Height for the bot image.
5. Switch to release configuration
6. Deploy the app to the device.

<ContentPage
    x:Class="StaticResourcesBug.MainPage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">
    <ContentPage.Resources>
        <ResourceDictionary>
            <x:Double x:Key="BotHeight">185</x:Double>
        </ResourceDictionary>
    </ContentPage.Resources>
    <ScrollView>
        <VerticalStackLayout Padding="30,0" Spacing="25">
            <Image
                Aspect="AspectFit"
                HeightRequest="{StaticResource BotHeight}"
                SemanticProperties.Description="dot net bot in a hovercraft number nine"
                Source="dotnet_bot.png" />
        </VerticalStackLayout>
    </ScrollView>

</ContentPage>

Link to public reproduction project repository

https://github.com/dhindrik/StaticResourcesBug

Version with bug

9.0.21 SR2.1

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

8.0.100 SR10

Affected platforms

iOS, Android, Windows, I was not able test on other platforms

Affected platform versions

iOS 18.2, Android 14, WIndows 10.0.19041.0

Did you find any workaround?

Put the values on each place instead of in a ResourceDictionary.

Relevant log output

[similar-issues-ai]

We've found some similar issues:

• Local resources not working in release configuration with more than one resource inside #26206 , similarity score: 82%

If any of the above are duplicates, please consider closing this issue out and adding additional context in the original issue.

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