In a decision tree, you can change the input expression to pick from a list. If you use the expression: [Pagelist Name] contains a page where [Property Name] equals [Value] the input for [Property Name] suggests a property reference. However, the property reference should omit the dot (.) notation. The property should be referred to by its name without the period prefix.
The dot (.) notation tries to resolve the property in class where the page list is defined rather than the actual property. In this instance, it's better to ignore the options in the Property Name drop-down selection list. Instead, enter the name of the property as text.