It is called "Dynamic Input", controlled by system variable "DYNMODE". Dynamic input has been there for quite a while (I think it was way before Acad2017), so, it is not an issue with your Acad2017 and Acad2019, nor it has anything to do with .NET API (Editor. GetKeyword()/GetXXXxx()). You can either change the value of "DYNMODE", or you can do it on AutoCAD UI easily
