lint-staged not adding files modified by prettier

Question

I'm running lint-staged (v11.0.0) as part of my pre-commit hook through Husky (v4.3.8). My lint-staged performs eslint (v7.27.0) and Prettier (v2.3.0). However, after Prettier runs, the "prettified" files aren't added to the commit.

How can files modified by Prettier as part of the lint-staged process be automatically added to the commit?

  "husky": {
    "hooks": {
      "pre-commit": "lint-staged"
    }
  },
  "lint-staged": {
    "{src,test}/**/*.ts": {
      "eslint ./src --ext .ts",
      "prettier ./src --write"
    }
  }