Reference to GameplayTag isn't resolved correctly if the blueprint is loaded before the GameplayTag is registered

From the UDN:

Steps to Reproduce

• In the attached sample project, open P_TestMap and just start a PIE session. Click on P button on your keyboard, you will see the message "GameplayTag: None".
• Open BP_TestPC and notice the node actually is referencing to the correct gameplay tag; Test.FailingTag. You can also go to the project settings and Manage Gameplay Tags and see the gameplay tag being registered as expected.
• Now right click on BP_TestPC asset in content browser and click on "Asset Actions > Reload"
• Once the asset is reloaded start a new PIE session, this time when you press P you will see the message "GameplayTag: Test.FailingTag" as expected.
• Now open GameplayTagTestSubsystem.cpp file and comment out the line we're loading the BP_TestPC prematurely. Recompile and restart the editor.
• When you start a new PIE session after the change, you will see the message "GameplayTag: Test.FailingTag" as expected again.