In the middle of the activites for this course, I decided to get rid of the WhiteSource Bolt Pull Request, so it would not keep showing up in my Project Board and PR list. The thing is, once I closed the PR, the GitHub Learning Bot took it as the action required to complete the current step of the training and close another PR (for which I hadn't completed the steps yet) and proceed to the next phase of the training.
From the community forum:
/cc @edusemensati