BP methods/macros no longer support passing arguments by reference?

I’m using 4.24 built from GitHub on my Ubuntu 16.04. It seems I can no longer define a parameter to a method or macro to be passed by reference. All I get is the box for the default value.

Methods created with previous version still have parameters as references, but can no longer be changed (the checkbox is missing).

Any idea what’s going on?

Are you sure those previous code chunks with ‘by ref’ are macros and not functions or custom events?

( Excuse me if I have that wrong :-/ ).

Just asking because I can’t understand how a macro can manage ‘by ref’ because it’s basically just a text substitution…