I’ve noticed for both my own iterations and the iterations during mentor sessions that in some cases the submission is stuck on ‘processing’. This way it is hard to tell if a submission passed the tests (I can of course still check locally) but I think this needs some investigating.
One of the people I mentored simply made a small change, submitted, undid the change and submitted again which fixed the processing status so I think whatever handles the processing hangs itself on some occasions?