forge: Production pruning fails when `yarn` is used to install and `npm@5` is used to prune

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I can’t believe that others have this problem, too. But I really don’t know what else could I test. Here is my minimal example to reproduce the problem (I am using OSX):

$ node --version && npm --version && yarn --version && electron-forge --version
v8.0.0
5.0.1
0.24.5
✔ Checking your system
3.0.5

$ mkdir test

$ cd test

$ electron-forge init
✔ Checking your system
✔ Initializing Project Directory
✔ Initializing Git Repository
✔ Copying Starter Files
✔ Initializing NPM Module
✔ Installing NPM Dependencies

$ yarn make
yarn make v0.24.5
$ electron-forge make
✔ Checking your system
✔ Resolving Forge Config
We need to package your application before we can make it
✔ Preparing to Package Application for arch: x64
✔ Compiling Application
✔ Preparing native dependencies
✔ Packaging Application
Making for the following targets:
✔ Making for target: zip - On platform: darwin - For arch: x64
✨  Done in 15.52s.

$ open out/test-darwin-x64/test.app

So I created a fresh project from scratch, package it and try to open the resulting app. But I get the following error:

A JavaScript error occurred in the main process

Uncaught Exception:
Error: Cannot find module 'electron-compile'
    at Module._resolveFilename (module.js:470:15)
    at Function.Module._resolveFilename (/Users/choffmeister/test/out/test-darwin-x64/test.app/Contents/Resources/electron.asar/common/reset-search-paths.js:35:12)
    at Function.Module._load (module.js:418:25)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/Users/choffmeister/test/out/test-darwin-x64/test.app/Contents/Resources/app/es6-shim.js:4:23)
    at Object.<anonymous> (/Users/choffmeister/test/out/test-darwin-x64/test.app/Contents/Resources/app/es6-shim.js:10:3)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)

Investigating the folder of the app I find, that the folder out/test-darwin-x64/test.app/Contents/Resources/app/node_modules is empty.

Is this an OSX problem?

Thanks for your help!