User Defined Enums don't support the UseEnumValuesAsMaskValuesInEditor meta specifier

The Make Bitmask node uses the flag index rather than the flag mask value unless the enum has the UseEnumValuesAsMaskValuesInEditor meta specifier. UserDefinedEnums in the editor don't support this flag at the moment, so reordering the UserDefinedEnum will change the value on the Make Bitmask node. 

• Create a UserDefinedEnum(Blueprint Enum Asset) in the editor - MyEnum
• Add a few entries A, B, C and check the Bitmask Flags check box under the advanced section
• Create a Blueprint and add a Make Bitmask node to the graph
• Set the Bitmask Enum property of the node to MyEnum
• Set the Bitmask pin value of the Make Bitmask to A
• Reorder the entries in MyEnum so that C is the first value
• Note that the value of the Bitmask node pin will change from A to C