Say there was a criminal trial, and the verdict was later set aside on appeal due to some critical procedure errors happened during questioning of one specific witness (out of many). For example, a line of questioning on redirect examination was wrongly disallowed even though it directly related to an issue that arose on cross-examination.
So, the verdict was set aside on appeal and a retrial was ordered.
Now, on retrial, would all the witnesses need to be heard again despite that the issue that needs to be corrected pertains to just one of them? Can not the rest of the evidence presented in the original trial be just re-admitted?
I am specifically interested in an answer for bench/judge-alone trials — where the judge is the trier of fact too. (In case of jury trials the requirement to re-hear all witnesses is pretty much understandable).
(Any common law jurisdiction).