Hi!
I wrote a small example of complex animation by color for a regular rectangle. And it seems that only the last animation is played (i.e. after BeginTime="0:0:50"). I checked this behavior in WPF and all animations are performed without problems.

<Grid
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Rectangle x:Name="Rect" Height="100" Width="100" Fill="LightGreen" VerticalAlignment="Center" HorizontalAlignment="Center">
<Rectangle.Triggers>
<EventTrigger RoutedEvent="Loaded">
<BeginStoryboard>
<Storyboard TargetName="Rect" TargetProperty="(Rectangle.Fill).(SolidColorBrush.Color)">
<ColorAnimation
BeginTime="0:0:0"
Duration="0:0:1" From="LightGreen" To="Red"
RepeatBehavior="10x"
AutoReverse="True" />
<ColorAnimation
BeginTime="0:0:10"
Duration="0:0:0.8" From="LightGreen" To="Red"
RepeatBehavior="12.5x"
AutoReverse="True" />
<ColorAnimation
BeginTime="0:0:20"
Duration="0:0:0.4" From="LightGreen" To="Red"
RepeatBehavior="25x"
AutoReverse="True" />
<ColorAnimation
BeginTime="0:0:30"
Duration="0:0:0.2" From="LightGreen" To="Red"
RepeatBehavior="50x"
AutoReverse="True" />
<ColorAnimation
BeginTime="0:0:40"
Duration="0:0:0.1" From="LightGreen" To="Red"
RepeatBehavior="100x"
AutoReverse="True" />
<ColorAnimation
BeginTime="0:0:50"
Duration="0:0:0.05" From="LightGreen" To="Red"
RepeatBehavior="200x"
AutoReverse="True" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Rectangle.Triggers>
</Rectangle>
</Grid>