one of my in-person interviewers at Google forgot they had to do this - I spent like 38 minutes of our interview whiteboarding and then he said, "oh crap you're supposed to do this on the computer" - i furiously typed for a few minutes to try to replicate what i'd done.
when i later talked to HR there was no mention of this in the interviewer's report.
when i later talked to HR there was no mention of this in the interviewer's report.