Vite + Vant + PostCSS-pxtorem Configuration - Global CSS Variables Compiled to REM on Hot Reload

I'm building a mobile project using Vite, Vant, and PostCSS-pxtorem. When I run npm run dev, the CSS units of Vant's global variables are compiled to rem. However, after a hot reload triggered by updating the Vite configuration, these units are no longer compiled. How can I resolve this issue?