Before You File a Bug Report Please Confirm You Have Done The Following...

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have searched for related issues and found none that matched my issue.
• I have read the FAQ and my problem is not listed.

Playground Link

https://typescript-eslint.io/play/#ts=4.9.3&sourceType=module&showAST=es&code=MYGwhgzhAEAqCmEAu0DeBYAUNaAHATgJYBuYS80A+gB7QC80AjANxY4DEAnvU65m9ADm8FNQAUASjTR8IgK74AdtCQALQhAB0NZtAC+A4Sk6TpspAuVqNmrroOY9QA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Y6RAM0Wls4CGAEwD2TeIXRRe0EdEjgwAXxBKgA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA

Repro Code

class Test {
  private _x = 1;
  #y = 1;

  get x() { return this._x; }
  get y() { return this.#y; }
}

ESLint Config

module.exports = {
  parser: "@typescript-eslint/parser",
  rules: {
    "@typescript-eslint/prefer-readonly": "error"
  },
};

tsconfig

{
  "compilerOptions": {
    // ...
  }
}

Expected Result

Triggers on private field and #field class fields.

Actual Result

Triggers on private field but not on #field class fields.

Additional Info

No response