Contact lens and medical

I just got my new medical. When I got the certificate I saw that under
limitations it said "None". My previous medical used to say "must wear
corrective lenses". I should have simply walked away with the
certificate, but instead I asked them why that limitation was missing.
The response was "You wear contacts? Well, that changes everything. You
should have told us about the contacts". The FAA form does not ask
anything about wearing lenses (except near vision), and they did not
ask me about it during the exam either. I thought all that mattered was
your corrected vision, not uncorrected vision. In the end we had to do
some extra stuff to get that fixed, and I got another certificate with
the correct statement. She said that I should stop wearing contacts for
24 hours before coming to the medical exam, and bring the lenses with
me. I have never heard of this before. Anyone else had similar
experiences?