Aprons not able to duplicate or add in the project

Well i am recreating the whole VABB airport, so i have add a lot of aprons in the project but now after the update if i open my project in sdk i cant add new apron or duplicate the aprons but i can move around the existing aprons but cant duplicate it. Is there any limit to add aprons ?. But my other scenery objects,sim objects are working fine only just this apron is causing the issue any idea how to fix it ???

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