Children of a Blueprint Class not Available in the Default Value Dropdown for a Variable of that Class

Creating a blueprint class, and then creating a few children of that class ( in this case, 4) does not display them as available options when setting the default value of a variable of that blueprint class' type. Initially, all of the children as well as the original blueprint appear in the dropdown, but upon restarting the editor, all but the original blueprint do not appear as options.

Found in 4.10.1. Reproduced in 4.11 Preview 1 and Main CL 2811183

1. Open the editor
2. Create a new actor blueprint called CustomClass
3. Create 4 children of this blueprint
4. Create another actor blueprint called OtherClass
5. Give the newly-created actor a variable of type CustomClass->Class.
6. Go to the class defaults tab and notice that CustomClass and all of its children are available options.
7. Restart the editor
8. Open OtherClass and go to the class defaults.
9. Click the dropdown for setting your CustomClass variable.

Result: All of the children of CustomClass have disappeared.

Expected: The original blueprint as well as the children would be options.

Fix UE-51650

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