This is not a known issue we’re aware of. Is it happening both in-browser and using the desktop app? What specific types of objects is it not working for?
Thanks for the context. If this is still happening, please flag this as a bug report to our support team directly via the form here: Submit a bug form →
I have been using Figma on Windows for years now. I just started using the Mac version and I am having this exact same issue. Pressing option key to duplicate works fine for some objects but it doesn’t for some others.
Did you solve this issue?