I often tell people that the OED believes it has far greater jurisdiction than a practitioner might think, and here's another anecdote: lawyer messes up in litigation (gets sanctioned) and the CAFC criticizes his brief as containing misleading statements.
What's that got to to with practice before the Office, which is the OED's purview? Nothing, in my view, but the OED, once again, came after the lawyer for conduct prejudicial to the administration of justice. The opinion is here (an agreed public reprimand).
I've seen this in various forms. Be careful out there.