Existence of a duty of care, although dispositive, is a question of law that, in the federal forum, is decided by the judge. As the division of responsibilities for finding facts and law at the trial stage is a procedural one, the procedures of the federal forum control.
Under state law, attorneys for LLC owed no third-party duty of care to LLC owner and manager.
http://media.ca7.uscourts.gov/cgi-bin/rssExec.pl?Submit=Display&Path=Y2018/D09-12/C:17-1999:J:Wood:aut:T:fnOp:N:2217358:S:0
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.