Hi Joe,
no, I´m pretty sure that this has nothing todo with the scenery - this is the typical effect of the sim-limitation, what we have described in the “Known Issues” category here:
I have tried it with the WorkingTitle CJ4, which don´t use the in-game flightmanagement because they have developed their own, and here you see the correct procedure - no waypoints truncated, leg page complete … sorry, it´s more the sim and this can be happen in the WorldMap and in all aircrafts/addons which uses the in-game flightmanagement. At the moment only the WT CJ4 uses their own flightmanagement, and this works nearly perfect as you see:
Cheers,
Richard