How does the implicit priority for automatic schedules work?

Question

Hi,

I am currently creating my first project-plan and I do have a really hard time understanding how project prioritizes the tasks in case of automatic scheduling.

In my current example I do have two tasks (with the same explicit priority) and the same resource assigned to them.

How does project decide, which one comes first?

My preferred solution would be some top-down-approach: Do the tasks with the lower task-number first.

But this does not seem to work :(