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• 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://github.com/hasakilol/react-vite/blob/master/src/Test.tsx

Repro Code

1. This is update to: Bug: [no-duplicate-type-constituent] fixer removes undefined from type #9230
2. I can't give you a reproduction on https://typescript-eslint.io/play/ because I'm using latest eslint and typescript-eslint packages.

ESLint Config

import tseslint from 'typescript-eslint';
import globals from 'globals';
import parser from '@typescript-eslint/parser';


export default tseslint.config(
  {
    name: 'plugins',
    plugins: {
      ['@typescript-eslint']: tseslint.plugin,
    },
  },
    
  {
    languageOptions: {
      globals: {
        ...globals.node,
        ...globals.es2015,
      },
      parserOptions: {
        allowAutomaticSingleRunInference: true,
        project: ['tsconfig.json'],
        tsconfigRootDir: '.',
      }
    },
  },

  {
    name: 'src',
    files: ['src/**/*.ts', 'src/**/*.tsx', 'src/**/*.mts', 'src/**/*.cts'],
    extends: tseslint.configs.recommendedTypeChecked,
    languageOptions: {
      parser,
      parserOptions: {
        ecmaFeatures: {
          jsx: true
        },
        sourceType: 'module',
      },
      globals: {
        ...globals.browser,
        ...globals.mocha,
        ...globals.jest,
        ...globals.jasmine,
      },
    },
    rules: {
      '@typescript-eslint/consistent-type-imports': 'error',
      '@typescript-eslint/no-duplicate-type-constituents': 'error'
    }
  },

    
);

tsconfig

{
  "compilerOptions": {
    "target": "ES2020",
    "useDefineForClassFields": true,
    "lib": ["ES2020", "DOM", "DOM.Iterable"],
    "module": "ESNext",
    "skipLibCheck": true,

    /* Bundler mode */
    "moduleResolution": "bundler",
    "allowImportingTsExtensions": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx",

    /* Linting */
    "strict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noFallthroughCasesInSwitch": true
  },
  "include": ["src"],
  "references": [{ "path": "./tsconfig.node.json" }]
}

Expected Result

https://github.com/hasakilol/react-vite/blob/master/src/Test.tsx#L8

No matter how you configure @typescript-eslint/consistent-type-imports ('off' or 'error') and @typescript-eslint/no-duplicate-type-constituents ('off' or 'error'),
item: { a: string; } | typeof Null | typeof Undefined, should not change after running npx eslint --fix src/Test.tsx.

Actual Result

When both @typescript-eslint/consistent-type-imports and @typescript-eslint/no-duplicate-type-constituents are configured error, item: { a: string; } | typeof Null | typeof Undefined, is changed to item: { a: string; } | typeof Null , after running npx eslint --fix src/Test.tsx.

When either @typescript-eslint/consistent-type-imports or @typescript-eslint/no-duplicate-type-constituents are configured off, item: { a: string; } | typeof Null | typeof Undefined, will not change (what I expect) after running npx eslint --fix src/Test.tsx.

Additional Info

"@typescript-eslint/eslint-plugin": "^8.0.0-alpha.14",
"@typescript-eslint/parser": "^8.0.0-alpha.14",
"@typescript-eslint/scope-manager": "^8.0.0-alpha.14",
"@typescript-eslint/type-utils": "^8.0.0-alpha.14",
"@typescript-eslint/types": "^8.0.0-alpha.14",
"@typescript-eslint/typescript-estree": "^8.0.0-alpha.14",
"@typescript-eslint/utils": "^8.0.0-alpha.14",
"@typescript-eslint/visitor-keys": "^8.0.0-alpha.14",
"typescript-eslint": "^8.0.0-alpha.14",

"eslint": "^9.3.0",