Need help: Token text color in RichSuggestBox resets after app theme change

[dzhukovsky]

before theme change:

after change from dark theme to light:

after change theme from light to dark:

This is a RichSuggestBox element bug that should be fixed

At the moment I have the following fix, but it is not ideal because... when changing the theme, there is a noticeable blue flicker before violet appears:

.xaml

 <wct:RichSuggestBox
     x:Name="SuggestingBox"
     ...
     SuggestionRequested="SuggestingBox_SuggestionRequested" />

.cs

private async void SuggestingBox_ActualThemeChanged(FrameworkElement sender, object args)
{
    foreach (var token in SuggestingBox.Tokens)
    {
        var textRange = SuggestingBox.TextDocument.GetRange(token.RangeStart.Value, token.RangeEnd.Value);
        textRange.CharacterFormat.ForegroundColor = SuggestingBox.TokenForeground.Color;
    }
}