The flags for form, parts, are resetting to the default
for the race, putting back any the builder has removed.
However, additional parts added by the builder do
remain.
For example removing the head from a human mob, the
head will be back after an asve and re-opening the
editor. However, if you add a tail, the tail will be
there, and not removed.
SHORT TERM WORKAROUND: I am adding a "custom" race to
my mud for builders to use, because unique does not
work as an option in olc.