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=5.3.2&fileType=.tsx&code=BQRgBA1GBMYJRgIYGcwDsCuBbARgUwCcAocKaAegCokxLylVNdCg&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1tiacTJTIAhtEK0ipWkOTJE0fJQ5N0UOdA7RI4MAF8QOoA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3TgwAXxCSgA&tokens=false

Repro Code

(1 + 2 ) as number
1 + 2/* a */ as number

ESLint Config

module.exports = {
  "rules": {
    "@typescript-eslint/no-unnecessary-type-assertion": "error"
  }
}

tsconfig

{
  "compilerOptions": {
    "strictNullChecks": true
  }
}

Expected Result

It should be fixed to

(1 + 2 )
1 + 2/* a */

Actual Result

It's fixed to

(1 + 2 
1 + 2/

Additional Info

UPD: it also doesn't provide (but it should) fixes when type annotation of angle bracket assertion contains some extra tokens: playground

<(number )>(1 + 2)