[CKEditor 5] MathType Plugin leads to 'Uncaught CKEditorError: ckeditor-duplicated-modules'

## Description The bug originates when trying to to incorporate MathType, according to the documentation, into a CKEditor5 Instance. Related to this [issue](https://github.com/wiris/html-integrations/issues/1041). <img width="693" alt="Image" src="https://github.com/user-attachments/assets/d802014e-5101-4270-8a8f-a6ba9281601b" /> ## Environment ### MathType - `"@wiris/mathtype-ckeditor5": "^8.12.0"` ### Other dependencies - `"@ckeditor/ckeditor5-react": "^9.5.0",` - `"ckeditor5": "^43.3.1",` - `"react": "^18.3.1",` - `"react-dom": "^18.3.1"` - `"typescript": "^5.8.2",` - `"vite": "^6.2.0",` ### Environment - local - Macbook (M4 ARM) - production - Azure Frontdoor CDN bundle ### Plugins ```tsx import { Bold, Essentials, Italic, Paragraph } from 'ckeditor5' import MathType from '@wiris/mathtype-ckeditor5/src/plugin.js' // ... plugins: [Essentials, Paragraph, Bold, Italic, MathType], ``` ## Steps to reproduce This public repository [react-mathtype-demo](https://github.com/brainboost-eu/react-mathtype-demo) holds an example of our stack. - Clone the repository - `pnpm install` - `pnpm dev` > N.B. The injection of the plugin is commented with a `FIXME` in [src/components/editor.tsx](https://github.com/brainboost-eu/react-mathtype-demo/blob/main/src/components/editor.tsx) ## Expected result Adding MathType to the plugin list should not break CKEditor. The expected result can be shown by commenting line # 18 in [src/components/editor.tsx](https://github.com/brainboost-eu/react-mathtype-demo/blob/main/src/components/editor.tsx) <img width="906" alt="Image" src="https://github.com/user-attachments/assets/7c9ed64c-5e62-4639-ad80-2015435cc637" /> ## Actual result The editor crashes, leading to a blank screen. The console shows <img width="693" alt="Image" src="https://github.com/user-attachments/assets/d802014e-5101-4270-8a8f-a6ba9281601b" /> ## Other details We are using the vite bundler and typescript, and according to the documentation, are importing `import MathType from '@wiris/mathtype-ckeditor5/src/plugin.js'`