Dragging off a pin in a Blueprint Function Library function does not give the user option to make a Local Variable

When in a function in a Blueprint Function Library, dragging off a pin will not give the user the option to promote it to a local variable. You only have the option to make a global variable (which you cannot have in a library).

Right-clicking the pin gives you the local variable promotion option.

This seems to only occur in a function library. A function in a common class blueprint does not have this issue.

1. Open any project in editor.
2. Create and open a blueprint function library.
3. In the function, add a Print String node.
4. Drag off the In String pin.

RESULT

User has the option to promote to a variable, but not a local variable.

EXPECTED

To be able to promote to a local variable.