If you are using variables from a Bolt Scene class, they are visable in the heirarcy, when in play mode. If you select a game object in the Hierarchy before entering playmode, this will block the generation of the scene variable container.

Video Attached.
[^SceneVariablesLostWhenGameObjectSelected.mp4]

Steps to reproduce

• Open Bolt 2.0.0.a12 with Unity 2019.4.0f.
• Create a Bolt Class and add it as a component to a game object.
• Add a Flow Graph to the class.
• Open the Flow Graph.
• In the project palette, create a Bolt Class but change the scope via the inspector to Scene.
• Add a String variable to the class and give it a value.
• Open your Flow graph.
• Add a debug.log to your graph.
• As it's input add the Scene Class string variable by dragging and droping it from the Bolt Explorer.
• Play the scene. Notice the creation of a scene variable container in the Hierarchy.
• Stop the scene and select a game object in the Hierarchy.
• Play the scene again

Notice issue >> The scene variable container is not created.

Tested Broken: 2019.4.0f1, 2.0.0a12
Tested Working: 2019.3.15f1, 2.0.0a10