Make a new drawing. Don't save.
Fill out the corner with your property tab built custom properties.
Make sure to fill something in all provided fields, especially description. Use the APPLY button to make sure it's all good.
Now save drawing and you may notice that whatever you filled in for description is removed in the custom properties window.
Now print and you'll see that it also gets removed from the drawing.
Solution, as soon as you make a new drawing, save it before doing anything else.