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