[no-unused-vars] new v4 false positive: generic type arg used as function parameter list

[mmkal]

• 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

{
  "rules": {
    "@typescript-eslint/no-unused-vars": [
      "warn",
      { "argsIgnorePattern": "^_", "ignoreRestSiblings": true }
    ]
  }
}

export type F<A extends unknown[]> = (...a: A) => unknown;

Expected Result

No error

Actual Result

Error - 'A' is defined but never used.eslint@typescript-eslint/no-unused-vars

Additional Info

When removing the ... before a, the error is no longer reported (although obviously this is a completely different type - just including this info in case it's helpful). i.e. this is fine:

export type F<A extends unknown[]> = (a: A) => unknown;

Versions

package	version
@typescript-eslint/eslint-plugin	4.0.1
@typescript-eslint/parser	4.0.1
TypeScript	4.0.2
ESLint	7.7.0
node	12.17.0

[backbone87]

Just an addition:

import { Foo } from './bar';

export type F<A extends unknown[]> = (...a: Foo<A>) => unknown;

In this example A as well as Foo are reported as unused.