I’ve just created a new editor module and added a custom async Blueprint node. Everything seems to work in the editor: I can place it in the editor and use it fine.
However on the next load, I get several load errors at startup, like these
/Game/Blueprints/MyBlueprint: Can’t find file for asset /Script/EditorModuleName
Failed to load /Script/EditorModuleName.K2Node_MyCustomNode Referenced by EventGraph Property /Script/Engine.EdGraph:Nodes
After startup the node works fine again, so maybe it’s not available when the project loads?