I use the spacemacs, in org-mode 9£¬under TODO item£¬I set "SCHEDULED: <2016-12-06 Tue 10:00-17:00 +1d> DEADLINE: <2016-12-09 Fri 18:00 -2d>"£¬press t , Done£¬and the 'SCHEDULED:' is disapear, only DEADLINE: <2016-12-09 Fri 18:00 -2d>£¬I don't know why ?Anyone meet the problem ?

when I try emacs -Q from terminal, used or-mode 8, all works well, maybe it's a bug for org-mode 9 ?