Why is the less code map not working?

Question

css

Hello!
Can you please tell me why the code map does not work locally for me?
The problem is solved when I upload the project to the hosting, then everything is fine - it shows the source code less.
I use Chrome browser, local MAMP server, Koala compiler, I work on Mac.
I set all kinds of browser settings, read articles on Habré, searched on google.