How to set DemoSpectatorClass to a blueprint class?

Development Programming & Scripting Blueprint
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1

Hey!

I am trying to set the DemoSpectatorClass in DefaultEngine.ini to a blueprint class. I have got the DemoSpectatorClass working with a c++ class using:

[/Script/Engine.DemoNetDriver]
NetConnectionClassName="/Script/Engine.DemoNetConnection"
DemoSpectatorClass="/Script/Haiku.HaikuPlayerController_Demo"

I have tried changing it to:
DemoSpectatorClass="/Game/Blueprint/Gameplay/PlayerController_Demo.PlayerController_Demo"
DemoSpectatorClass="/Game/Blueprint/Gameplay/PlayerController_Demo.PlayerController_Demo_C"

but neither worked. What is the correct way of specifying a blueprint class for this? Thanks!!