some clients might display a duplicated message. I sent one as a threaded reply. I realised I broke the root tag in threaded replies a few days ago (in commit 9730750d5f552aa055864b59b6ea8af78cde9661) this is now fixed by commit 34ab67cf6721ab7aa200a0fcd93f9fe6fea45d33.

I guess it is still very much in an alpha state.