Regarding the underpants...
The tutorial states to enable Auto Destroy in the ItemPrefab serving as underpants within the Event Interaction inspector settings. Doing so destroys the object while the quest is not in the correct variable state, as I think is intended; however, it never "spawns", even after the variable state conditions are met.
Disabling auto destroy allows it to work sensibly - it's there, and allows you to pick it up and turn in to the quest. Already having the pants was even part of the quest as created in the editor.
Can you describe how this interaction is supposed to take please?
Side note: In the completely tutorial project, the ItemPrefab is immediately infinitely falling, making it inaccessible. I made zero changes to the scene, and only discovered it when trying to compare my project vs the tutorial's.