As of Nx 15.0.11, we only include any package.json file that is referenced in the workspaces property of the root package.json file in the graph. (lerna.json for Lerna repos or pnpm-workspaces.yml for pnpm repos)
If you would prefer to add all package.json files as projects, add the following configuration to the nx.json file:
{ "plugins": ["nx/plugins/package-json"]}