Default value of static lists are not selected in object editor

Steps to reproduce

1. Login as an Administrator
2. Create an xclass in any page
3. Add a property of type 'Static List' to this xclass
4. Set 'Default Value' to 'c'
5. Set 'Values' to 'a=b|c=d'
6. In any page, open the object editor and add an instance of the xclass

Expected result

The value 'd' is selected in the static list

Actual result

The value 'b' is selected

Note that setting the default value to 'e' will actually select 'e' even though it's not in the list of possible values, so my guess is that the default value is actually selected but not displayed as such.