Why is it that

dismantle(3*a);

returns a SUM entity?

SUM(3)
   NAME(4): a
   INTPOS(2): 3

dismantle(3+a);

also returns a SUM entry

SUM(5)
   NAME(4): a
   INTPOS(2): 1
   INTPOS(2): 3
   INTPOS(2): 1

ToInert() looks fine for both of these.

Tested on Maple 16, Maple 17, Maple 18