Analyzing local SwiftPM packages doesn't work.

[rodionov-andrei]

in release version 2.11.0
"Add support for analyzing local SwiftPM packages in Xcode projects."

I have a Xcode project with local SwiftPM packages. I ran periphery with 'periphery scan' and follow guided set up.
Scanning don't show any unused code in packages.

I'm sure i have unused code in local packages.
I've tried periphery scan --clean-build

So, does periphery actually analyze local packages or not? What can be wrong?