Error: invalid operation: Invalid block: block must be a string

[RafaelMaier94]

Describe the bug
I have been trying to get BlockNote working with Gemini. It's a demo really, there's nothing special about it.I pretty much copied everything from the documentation, just changed the model to Gemini-2.0. I am using Blocknote@0.33.0, so that should work.

To Reproduce

1. Create an app with the blocknote text editor
2. Add the ai component
3. Add a gemini model
4. Try and interact with it

StackBlitz:
https://stackblitz.com/edit/github-zvbzpwcp?file=App.tsx,package.json

Misc

• Node version: v23.5.0
• Package manager: npm
• Browser: Chrome
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