make-dedicated-lockfile doesn't pick up local packages

[xpluscal]

Here's the scenario:
I have a monorepo consisting of multiple packages. none of them published to a registry.
now I want to build one of those packages and run in production.
the packages has dependencies of the monorepo.

I'm using make-dedicated-lockfile to generate a build, but it fails, saying it can't find packages as it's searching in registry instead of workspace.

what am I doing wrong?