Yes, got the latest version 3.20.0100.
tried it with
/xchatname Blah
#(!P)
#/xchatname Andrey
and
/nick Blah
#(!P)
#/nick Andrey
Both don't work...the second one just changed my name to:
Blah
#test
#/nick Andrey
Seems like the # isn't recognised and just the first /xchatname is executed and the rest seen as part of this command