Problem with Inertia.js SSR not rendering server-side in Laravel 12 with React

[Dommmin]

I'm experiencing issues with Server-Side Rendering (SSR) in a fresh Laravel 12 installation using the React starter kit. Despite following the documentation, the page continues to render client-side (CSR) instead of server-side.

Setup:

Laravel 12 (fresh installation)
Inertia.js with React starter kit
Node.js 22
Running composer dev:ssr (Vite SSR server starts on port 13714)
Problem:

SSR build completes without errors (resources/js/ssr.tsx)
Inertia SSR server runs on port 13714
Browser still shows CSR behavior (no server-rendered markup)
Same issue occurs in production with:

PM2 running php artisan inertia:start-ssr (tried also "node bootstrap/ssr/ssr.js")
Server should return fully rendered HTML on initial page load.