Its not possible to load a plan starting at the gate or ramp that was selected when saving the plan. Also the Approach is not stored in the *.pln file (IFR planning). Please store and load that information to / from the *.pln file.
Additionally:
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Selecting a new parking position in the loaded / current plan should never ever automatically change the plan to the default one.
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The user should be asked if the World Map planner should return to the default plan when selecting a different runway for departure as stored in the plan.