Application error in live preview

Hi,

The demo application (https://headless-cms-yaml-input.vercel.app/) is currently not working. It shows this message on screen:
> Application error: a client-side exception has occurred (see the browser console for more information).

And this message in the console:
> Error: Unrecognized extension value in extension set ([object Object]). This sometimes happens because multiple instances of @codemirror/state are loaded, breaking instanceof checks.
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Open the live preview at https://headless-cms-yaml-input.vercel.app/ and reproduce the client-side exception while inspecting the browser console. Trace the CodeMirror setup around the reported @codemirror/state extension error; done means the demo loads and the YAML input preview works without this console error.

Written by the indexing model from the issue text.