Bug explanation

The following new styles for the Numeric- and DecimalUpDown control do not work:
MaterialDesignFilledNumericUpDown
MaterialDesignOutlinedNumericUpDown
MaterialDesignFilledDecimalUpDown
MaterialDesignOutlinedDecimalUpDown

This exception gets thrown:

Here is my xaml:

<materialDesign:DecimalUpDown HorizontalAlignment="Center"
                              VerticalAlignment="Center"
                              Style="{StaticResource MaterialDesignOutlinedDecimalUpDown}"
                              Value="0" />

I think this is related to (or the same as) #3731

Version

5.2.0