So I am not sure if others are able to reproduce this but I noticed it for the second time and thought that it was a little odd.
When I go into Site Drawing Mode and go to draw a Site Line for the Property by Enter Surveyors Coordinates, I am able to draw out the full site and close it. But then if I try and do another one in the same drawing, it won't work.
Now it is not often that I draw 2 properties in the same drawing but one today was where they were combining 2 lots. But I recall having the same problem a couple months ago when I mis-drew the first property and erased it to draw another one and it would not let me.
I found that the fix is that I can close the entire project file and not just the drawing file and open again and then it allows me to draw with Enter Surveyors Coordinates again but I am not sure why it won't let me do 2 in the same file from the start. I believe that it would allow this before 2020 but I am not sure.