Default values not changing when dependencies updated

[chopfitzroy]

Prerequisites

• I have searched the existing issues
• I understand that providing a SSCCE example is tremendously useful to the maintainers.
• I have read the documentation
• Ideally, I'm providing a sample JSFiddle, Codesandbox.io or preferably a shared playground link demonstrating the issue.

What theme are you using?

core

Version

5.x

Current Behavior

Trying to use default values with dependencies but the formData does not update.

Visually the form does update which is quite confusing for the user. Fortunately if the user tries to submit the validation does catch the error.

Interestingly if I use if / then the issue presents the same but I do see warnings in the console, example here: https://codesandbox.io/p/sandbox/nagaozen-react-jsonschema-form-playground-forked-8g34z7 (this is different from the Codesandbox link below, please check both)

A number of issues suggest that this may be to do with uncontrolled vs. controlled forms but I have tried with both.

• default value does not work #975
• Dependency defaults do not render for uncontrolled Form components #1316
• Selector not working inside dependency for uncontrolled components #1394
• Playground support for uncontrolled components #1399

These issues may also be tangentially related but it is hard to tell:

• OneOf not able to retain the default values when switching between the options #4322
• oneOf not selecting correct default value for complex objects with the same property keys #4208
• Default values not set inside allOf #3892

Expected Behavior

When changing from Cat to Fish I expect the formData to update food from "meat" to "worms".

Steps To Reproduce

Example here: https://codesandbox.io/p/sandbox/nagaozen-react-jsonschema-form-playground-forked-t8f767

• Select Cat
• Check console should see {food: 'meat', animal: 'Cat'}
• Select Fish
• Check console should see {food: 'meat', water: 'sea', animal: 'Fish'}
• Try to submit the form - validation should prevent this

NOTE: The inverse is also true if you start with Fish and then select Cat food will be "worms"

Environment

- OS: WSL 2 - OpenSuse Tumbleweed
- Node: v22.6.0
- npm: 10.8.2

Anything else?

No response

[nickgros]

@chopfitzroy Your second CodeSandbox isn't working for me. Can you check that it's shared publicly?

[nickgros]

I expected this to work if we set the experimental_defaultFormStateBehavior to { allOf: 'populateDefaults' } but that didn't work. Definitely a bug here. I think we have a few similar reports related to conditional logic, allOf, and computing default values.

[chopfitzroy]

@nickgros sorry about that! Link is public now.