Due to the setup all tests are by default biased since the cursor doesn’t change when hovering over buttons or interactive objects. Today you can enable “pointer cursor” but only for the buttons and objects that will help you complete the task. But this is not how a website works in reality - All buttons and interactive objects will activate the pointer cursor. This will lead to the following issue; users will search for buttons that will enable the pointer cursor instead of actually solving the task. If you disable pointer cursor users might think that the prototype doesn’t work since nothing happens when they hover over buttons and object or click on “incorrect” buttons.
The best thing would be to enable ALL objects and buttons and then assign an error message to the incorrect buttons and objects saying something like “Clicking here will not complete the task - Try to something else”.