• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have read the FAQ and my problem is not listed.

Repro

https://github.com/SimonSimCity/no-unnecessary-condition-bug-4954

{
  "rules": {
    "@typescript-eslint/no-unnecessary-condition": ["error"]
  }
}

interface Property {
  [key: string]: [string] | undefined;
}

// Works correctly
((p: Property) => {
  return p.test?.[0].charAt(2);
})({} as Property);

// Should also not report anything ...
((p: Property | undefined) => {
  return p?.test?.[0].charAt(2);
})(undefined);

My tsconfig:

{
  "compilerOptions": {
    "module": "commonjs",
    "target": "es2020",
    "lib": ["es2020"],
    "outDir": "dist",
    "rootDir": ".",
    "sourceMap": true,
    "strict": true,
    "esModuleInterop": true,
    "resolveJsonModule": true
  }
}

Expected Result

Not to report any error.

Actual Result

The rule reports:

Unnecessary optional chain on a non-nullish value. eslint[@typescript-eslint/no-unnecessary-condition](https://typescript-eslint.io/rules/no-unnecessary-condition)

Additional Info

I've started off with older versions of the packages listed below, updated to the mentioned versions, but the problem still persists. Only node I haven't updated, of all packages the mentioned version is the latest as of the time writing.

Versions