Presumably that person is being held in remand because there were concerns about their showing up for the trial. But at the end of the day, if they don't show up for the trial they will be found guilty presumably. They're not presenting evidence and they will have already been punished for the crime that they were found guilty of committing because they spent the appropriate amount of time in jail already. I don't see it as an enormous impact on the actual fairness of the trial.
On September 17th, 2018. See this statement in context.