Hi,

OK, I can reproduce the issue.

But I think it is not a bug because everything works "as designed".

When you accrue endpoint (corner of the rectangle) with object snap tracking you do only half a work to enable object snap tracking. You can only be sure that tracking work if you see tracking vector (green dotted line). If you have NEA object snap enabled and hover crosshairs over the line you can see that tracking vector doesn't appear, thus object snap tracking is still not enabled and you cannot simply use keyboard entry, furthermore - because of the NEA object snap cursor snaps each time you hover it over the line and AutoCAD gets "confused" about keyboard entry.

As soon as you move crosshairs to the left and cursor no more snaps NEArest to the line - the tracking vector appears and you can use keyboard entry.

I attached screencast to illustrate my words.

Maxim