Cannot add new component in the FormBuilder

[corgoss]

Describe the bug
I cannot add new components in the FormBuilder if FormBuilder has prop initialProp

To Reproduce
Download https://github.com/formio/react-app-starterkit and add initialForm in the FormBuilder. See screenshot

1. Go to 'http://localhost/#/components'
2. Edit Code based on screenshot '....'
3. Add new component like text field with DnD
4. See error

Expected behavior
No error and i can add new component to the form

Screenshots
https://jam.dev/c/8c9ac61b-49c0-4852-8718-cc60f8d7c20f

Sandbox Example
https://codesandbox.io/p/github/formio/react-app-starterkit/master

Desktop (please complete the following information):

• OS: macOS
• Browser Chrome
• Version 134

[olgabann]

@corgoss, thank you for the issue you submitted. However, I wasn’t able to reproduce it on my end. Could you please share the versions you're using?
Here are the versions I'm working with:
"@formio/js": "5.0.0-dev.5621.91bd945",
"@formio/react": "6.0.0-dev.568.ced0fbd"

Monosnap.Video.2025-04-24.11.0.mp4

[jpoeppel]

I have the same problem, it appears that passing something to initialForm is the problem (which you @olgabann may not have done). Related to #576

A similar issue appears if one sets options. I think it has something to do with the props being passed to the FormBuilder to be themselves variables within the parent component. E.g. it appears to be fine to pass an initalForm in as a property to the parent and pass it along to the FormBuilder, but it is not fine to have a const initialForm = {...} within the parent component itself, if the parent component rerenders onChange.