How to reproduce:
# Open HUB;
# Create 3D(HDRP) project;
# Create visual effect graph in the "Project" window  (Create->Visual Effects-> Visual Effect Graph);
# Double click on it
# Go to "Inspector" tab and click "Open" button;
# In the opened graph window turn on "Blackboard";
# Click "+" and add category to the list;
# Hover on newly added category item and click right mouse button;
# Observe that "Duplicate" function with shortcut "Cmd+D" is displayed in the list (screenshot added in the "Attachments" section);
# Try to duplicate category with "Cmd+D"

Expected result: Category should be duplicated.
Actual result: Nothing happens.

Note: Duplication works with other combination "Ctrl+D".

Reproducible with: 2021.3.20f1, 2022.2.9f1, 2023.1.0b7, 2023.2.0a5.

Not reproducible with: 2020.3.46f1 - "Duplicate" function not available in this stream.

Tested on MacOS Monterey, Version 12.6.2