Repro: Regex Works in Dev Mode, but Breaks in Production Build

The following statement evaluates differently when run in React Dev mode versus a production optimized build produced by create-react-app:

/[^\d\-a-z]/iu.exec("a")

Repro Steps

1. Clone and navigate to repo:

   $ git@github.com:rwoll/repro-create-react-app-regex.git
   $ cd repro-create-react-app-regex
   

2. Install dependencies:

   $ npm i
   

3. Launch the app in dev mode:

   $ npm start
   

Observe true is displayed.

4. Build the production optimized version of the app, and launch on port 4000:

   $ npm run build
   $ npx serve -s build -l tcp://localhost:4000
   

Observe false is displayed.

Both cases should be consistent and display true; however, something as part of the production build (Terser?) is making the code wrong.

Build Env

node: v14.7.0
macOS: 10.15.6
chrome: 85.0.4183.102