Uncaught Error: Item with the given id was not registered
Scenario
When I update the @ckeditor/ckeditor5-react from 3.0.2 to 3.0.3, I got the error like

It occurs with every version of ckeditor5 from 25.0.0 to 31.0.0.
No custom plugins involved.
I can not tell which changes make this error. https://github.com/ckeditor/ckeditor5-react/compare/v3.0.2...v3.0.3
Follow the error stack, it looks like this line trigger the error.
Hi, thanks for the report. Could you share some more details and steps to reproduce this issue? Does this happen also if you install a fresh app with version 3.0.3? Does this happen with some particular plugins set, during editing, when loading some content or just during empty editor initialisation? We need more information to look into this.
I find a scenario today.
I have a page having react-select and ckeditor5-react fields together.
I have an old version of react-select, I update it by yarn upgrade react-select@^5.2.1.
- "react-select": "^3.1.1",
+ "react-select": "^5.2.1",
and I update ckeditor5-react by yarn upgrade @ckeditor/ckeditor5-react@^3.0.3
- "@ckeditor/ckeditor5-react": "3.0.2",
+ "@ckeditor/ckeditor5-react": "^3.0.3",
then the error Item with the given id was not registered is gone.
If I only update to react-select@^4.3.1, and the error will still happen.
The error is saying that this.props.editor is not registered in this change of [email protected]. I think it is about update issue of react component (ref1, ref2).
Two major changes of react-select@^5.0.0 is the usage of forwardRef and removal of react-input-autosize.
It is sure that ckeditor5-react@^3.0.3 is only compatible with react-select@^5.0.0.
hey, any updates on this?
have the same problem
I'm getting this same error when upgrading from "3.0.2" to "3.0.3". I realized I had react-select installed but wasn't using it. I removed it from my package.json but the error is still occurring.