UX 340 is listed twice in Jean Grey’s chronology, once in publication order and again after UX 385, during X-Men Forever #4.
The Uncanny X-Men Index says nothing about this in either the UX 340 entry or the UX 385 entry, so I say we just delete the second UX 340.
PHOENIX VI/JEAN GREY SUMMERS
…
XMF 4
**UX 340 (delete)
**XMF 4 (delete)
XMF 5
…