TextBlock Text is not rendering correctly

[viktorspacil]

Hello,
does anybody encountered following odd behavior (Apple Silicon M3, MacOS Sonoma 14.4.1, Avalonia UI 11.0.10, FluentIcons 1.1.224, FluentAvaloniaUI 2.0.5) when Text of TextBlock is not rendered correctly (wrong size, foreground or does not shown at all)? When I look onto TextBlocks using Avalonia DevTools then I can see, that properties are set correctly. I am using DynamicResource to set the Text property (to be able to dynamically change the language during application lifetime). Item template looks basically like this:

<ControlTemplate>
    <Grid ColumnDefinitions="*,Auto" RowDefinitions="Auto,*">
        <Grid
            Grid.Row="0"
            Grid.Column="0"
            ColumnDefinitions="Auto,*">
            <ic:SymbolIcon
                Grid.Column="0"
                VerticalAlignment="Center"
                FontSize="24"
                Symbol="{TemplateBinding Icon}" />
            <StackPanel VerticalAlignment="Center" Orientation="Vertical" Grid.Column="1" Margin="12 0 0 0">
                <TextBlock Text="{TemplateBinding Title}" 
                           ToolTip.Tip="{TemplateBinding Title}" />
                <TextBlock
                    Foreground="{DynamicResource TextFillColorSecondaryBrush}"
                    Text="{TemplateBinding Description}"
                    TextTrimming="CharacterEllipsis"
                    TextWrapping="NoWrap"
                    ToolTip.Tip="{TemplateBinding Description}"
                    Theme="{StaticResource CaptionTextBlockStyle}" />
            </StackPanel>
        </Grid>
        <ContentPresenter
            Grid.Row="0"
            Grid.Column="1"
            Margin="12,0,0,0"
            Content="{TemplateBinding InnerRightContent}" />
        <ContentPresenter
            Grid.Row="1"
            Grid.Column="0"
            Grid.ColumnSpan="2"
            Margin="0,8,0,0"
            Content="{TemplateBinding Content}"
            IsVisible="{TemplateBinding Content,
                                        Converter={x:Static ObjectConverters.IsNotNull}}" />
    </Grid>
</ControlTemplate>

When I do any change on the page (like a user change of the language causing property data change or move to another page and back) then the rendering is fixed. This odd behavior appears randomly when a user is browsing through application pages. It is also interesting that only some of the TextBlocks are affected. Do you have any advice or hint what to check/debug? Thank you.

Wrong:

Correct:

[timunie]

A controlTemplate is to be used in Styles or ControlThemes only. Can you file a complete minimum sample please?

Note: there's a known issue with dynamic resources in PopUps after switching theme but I doubt it is what we see here.

[viktorspacil]

Ok, I will try to strip to code to bare minimum.

[viktorspacil]

render-bug-textblock-2.zip
Hello, here is my second try to provide the minimum sample, this is the bare minimum, because it seems that the bug is harder to replicate if the complexity of app gui is lowered. With this sample I have to repeat the steps almost for 100 times (or more) to replicate the odd behavior. You can see the problem even on the main page (missing text, smaller font, see screenshots below).
I am able to get the bad rendering within 5 repeats in the original application (MacOS or Windows).
If it helps I am opened to do videocall because we need to resolve this "bug" otherwise it is going to be reported immediatelly after we release the app to the end users. Thank you.

Wrong:

Correct:

[jmacato]

Hi @viktorspacil

We only offer extended case support such as video call assistance with our Enterprise Support tier customers as listed here:

https://avaloniaui.net/Support

Thanks!

[viktorspacil]

Thank you, if we will not resolve this issue within boundaries of this discussion then we will have to use the help of enterprise support.

[timunie]

because it seems that the bug is harder to replicate if the complexity of app gui is lowered.

Well that seems like we are not able to unblock you from pure community support 😢. I think it is a good idea to reach out to the team to get this sorted out via support contract. Thank you.