Bug or working as intended with flight planning?

Noticed something last night that took me 30 minutes of flailing around and eventually exiting and coming back in to fix.  After some more testing this afternoon, not sure if this is a bug or what.  Create a flightplan, doesn't matter aircraft, IFR/VFR etc.  Save it with the Load/Save option.  Go back to Nav Log, you can't edit the cruise altitude.  It's grayed out.  Clear the airports out totally, change aircraft, whatever, it's still grayed out and locked to whatever altitude of the saved plan.  I.e if  you created a high altitude airliner flight then decided at the last minute to go VFR in a prop, the cruise altitude is still locked out.  I just tested this further starting with a 320, then changed it to the Cirrus SR22.  While the altitude was still locked out, it changed it from 390 to 190 which while an improvement is actually still 1500 feet over that aircraft's max cruise.  The ONLY way to fix this is the "F12 Reset" option.  

Just wondering if this is a bug that should be reported in Zendesk or some sort of intended behavior that you just have to flat out reset the planner after saving a plan.  Note,  you can later fire the sim up and load that same plan and the cruise altitude is editable.