HUD died 1/3 into workout, but workout apparently still continued

1/3 into my workout ride this morning the HUD went poof. But apparently the workout still continued as I could feel the expected resistance changes on the trainer. Has anybody been able to resurrect the HUD so that you can continue the workout. And if not, what happens if you finish the workout without the HUD, do you still get credit for it (didn’t want to spend an hour finding it out :)).