Wolverine currently has X-23 6-FB listed twice in his chronology, and Jean Grey has it once. However, they don’t appear in X-23 6-FB. They do appear in X-23:TX 6-FB, though.
PHOENIX/PHOENIX FORCE/PHAL'KON/"JEAN GREY"
…
UX 426-BTS
**X-23 6-FB-BTS (delete)
*[X-23:TX 6-FB-BTS]
X 135-BTS
…
PHOENIX VI/JEAN GREY SUMMERS
…
UX 426
**X-23 6-FB (delete)
*[X-23:TX 6-FB]
X 135
…
WOLVERINE/"LOGAN"/JAMES HOWLETT
…
UX 426
**X-23 6-FB (delete)
*[X-23:TX 6 (3:1-3:2)-FB]
EX3 28
…
X 139
**X-23 6-FB (delete)
*[X-23:TX 6 (3:3-21:3)-FB]
X 140
…