Spring switches are designed to only ‘spring’ in one direction for a trailing movement. Normally, Spring Switches allow diverging movement to access the Main Track when departing other than Main Track.
IF a Spring Switch has been LINED to allow a FACING POINT movement from the Main to the other than Main Track and then a trailing point movement operates straight on the Main - it will damage the switch mechanism unless the switch operating mechanism is thrown to allow for Spring operation when trailing through the other than Main Track side.
(The spring and hydraulic housing of the mechanical switchman is toast … and not cheap to replace. Those rascals rarely work right or can be repaired after being mangled. And they are getting harder to replace. (old tech))
Normal is which ever way the bulk of the traffic goes. Plenty of situations where there are left hand turnouts with right hand frogs, usually in yards, drill tracks and other low speed places … fortunately rigid carbon frogs are less common than they used to be and railbound manganese (RBM) cast inserts are more plentiful along with cast self-guarded frogs in the yard that can handle either direction equally . The concern is more focused on the fit and wear of the stock rail and switch points in the reversed scenario - the turnout becomes more susceptible to “picked-switch” derailments because of the extra wear on the curved side will attack the thin edges of the points faster.
A variable switch will push over and stay there. Variable switch stands and self guarded frogs should not be found in main tracks as a general rule.