I tried the attached mod but couldn't bring the character into a situation where the 'training session' crafting was stopped due to any circumstance, be
it fatigue or anything else, so I couldn't really observe what happens within that condition. Aborting the task manually (ESC) didn't leave any unfinished work-in-progress data, though.
Can you provide a savegame with this situation going on?
Work-in-progress items can't be discarded, but like Plotinus mentioned they should be continued by crafting the same item again, but you may have tried that already.