Go to type definition not always working

VS C# 8.2.88.1811 (previous too). go to type definition do not works in 98% cases. Checked fire and it works always.
For example write DISPATCH_TIME_FOREVER, put mouse cursor on it and right mouse button and select “Go to type definition” or “Go to definition”.
Or this example: UISwipeGestureRecognizerDirection.UISwipeGestureRecognizerDirectionDown

click on UISwipeGestureRecognizerDirectionDown with right mouse button and select “Go to type definition” or “Go to definition”.

Error message:

External type, cannot jump to: UIKit.UISwipeGestureRecognizerDirection
Can’t go to type definition - exception (Object reference not set to an instance of an object.)

No idea what cause to work it in 2% sometimes. Now testing with VS 2013 community update 5 (previous update 4)

b.r.

Thanks, logged as bugs://72737

bugs://72737 got closed with status fixed.