Extra input created when duplicating BPinterface function

How to reproduce:

Create new blueprint interface

Add a new input argument to NewFunction_0

Select NewFunction_0 and press Ctrl+w
to duplicate

Bug: Newly created NewFunction_1 has two input arguments with same name

Expected: Newly created NewFunction_1 has one input argument as NewFunction_0 does

Pressing ‘Remove this parameter’ button next to input argument removes both parameters

UE version 4.16.0-3405315+++UE4+Release-4.16