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=5.8.2&fileType=.tsx&code=CYUwxgNghgTiAEYD2A7AzgF3hkmBc8AgjDFAJ4A8A3vFAPwGYwCWKA5vAL4B8A3AFD8A9EPgAlEAAckMHMHgAjMvAAqZSSADKYFpKxQ02ABYIkCgFbgszQ9LRpmCiMoDkAVxSgAZqxDAX-DiYANoADAC6AHRQAvzMXvAAFEEYYeF00QCU8FT88PAi8ADyesyoUBCIRlCsrBw2KC5YKOC4aLDKJnB52LipEdG8%2Bfn8nILxSSlpGVDZufmFmkZIbhDyCghw0rJ%2Bim5YwEi4jRh0PVMRMwJjQA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1tiacTJTIAhtEK0yHJgBNK%2BSpPRRE0aB2iRwYAL4gtQA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eAcgK6qoDCAFutAGsylBm3QAacDUhFYAVSLQ%2Bg9ABMAkkVXoAHmoCC0aOhLCwo9FIC%2BIK0A&tokens=false

Repro Code

declare const test: Array<{ a?: string }>;

// Reported by TypeScript as the object is possibly 'undefined'
test[0].a;

if (test[0]?.a) {
  // Optional chaining isn't necessary here
  test[0].a;    
}

if (test[0]?.a) {
  // Should be reported but doesn't?
  test[0]?.a;
}

ESLint Config

module.exports = {
  parser: "@typescript-eslint/parser",
  rules: {
    "@typescript-eslint/no-unnecessary-condition": "error",
  },
};

tsconfig

{
  "compilerOptions": {
    "strictNullChecks": true,
    "noUncheckedIndexedAccess": true
  }
}

Expected Result

I expected the rule to report on unnecessary optional array index access when noUncheckedIndexedAccess is enabled.

Actual Result

The rule seems to fails to catch these unnecessary optional array index access cases when noUncheckedIndexedAccess is enabled.

Additional Info

No response