laravel's environment file .env always clean itself during development

I face an issue when in development, my laravel's environment file : .env, usually clean itself whenever I update the client-side code (*.vue files).

I'm using VueJS as client and running the run-time build/watch whenever we have some change, we can refresh the browser to see the change but usually, I don't know why it always clear the laravel .env file to a blank file. It's so annoy.

Who might face the same issue? Any solution or way to find-out the root cause?

Noted: In production, it's OK. (Laravel 5.8 / VueJS 2.x)

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