[Rust] update_registration_flow error handling

Preflight checklist

• I could not find a solution in the existing issues, docs, nor discussions.
• I agree to follow this project's Code of Conduct.
• I have read and am following this repository's Contribution Guidelines.
• I have joined the Ory Community Slack.
• I am signed up to the Ory Security Patch Newsletter.

Ory Network Project

No response

Describe the bug

UpdateRegistrationFlow ResponseContent.entity returns a different empty status compared to ResponseContent.statuscode. ErrorBrowserLocationChangeRequired always returns None:

pub struct ResponseContent<T> {
    pub status: [StatusCode](https://docs.rs/http/0.2.11/http/status/struct.StatusCode.html),
    pub content: [String](https://doc.rust-lang.org/nightly/alloc/string/struct.String.html),
    pub entity: [Option](https://doc.rust-lang.org/nightly/core/option/enum.Option.html)<T>,
}

ResponseContent {                                                                                                                                              
    status: 400,                                                                                                                                                          
    content: "{\"id\":\"523d1fbe-ea1c-41f5-9668-ea5f2e835e77\",\"oauth2_login_challenge\":null,\"type\":\"browser\",\"expires_at\":\"2024-02-17T20:32:11.599968Z\",\"issue
d_at\":\"2024-02-17T20:22:11.599968Z\",\"request_url\":\"http://127.0.0.1:4433/self-service/registration/browser\",\"ui\":{\"action\":\"http://127.0.0.1:4455/.ory/kratos/
public/self-service/registration?flow=523d1fbe-ea1c-41f5-9668-ea5f2e835e77\",\"method\":\"POST\",\"nodes\":[{\"type\":\"input\",\"group\":\"default\",\"attributes\":{\"na
me\":\"csrf_token\",\"type\":\"hidden\",\"value\":\"lHGdy8Jg7U2bc4Zj8LSvvi953WxVSvOPOwDlzQt6A1IU5LcDNs1TeTmCPbgRgepwTonOjLUALwkP3kfbpxe4wQ==\",\"required\":true,\"disable
d\":false,\"node_type\":\"input\"},\"messages\":[],\"meta\":{}},{\"type\":\"input\",\"group\":\"password\",\"attributes\":{\"name\":\"traits.email\",\"type\":\"email\",\"
value\":\"test@example.com\",\"required\":true,\"autocomplete\":\"email\",\"disabled\":false,\"node_type\":\"input\"},\"messages\":[],\"meta\":{\"label\":{\"id\":107
0002,\"text\":\"E-Mail\",\"type\":\"info\"}}},{\"type\":\"input\",\"group\":\"password\",\"attributes\":{\"name\":\"password\",\"type\":\"password\",\"required\":true,\"a
utocomplete\":\"new-password\",\"disabled\":false,\"node_type\":\"input\"},\"messages\":[{\"id\":4000005,\"text\":\"The password can not be used because the password has 
been found in data breaches and must no longer be used.\",\"type\":\"error\",\"context\":{\"reason\":\"the password has been found in data breaches and must no longer be 
used\"}}],\"meta\":{\"label\":{\"id\":1070001,\"text\":\"Password\",\"type\":\"info\"}}},{\"type\":\"input\",\"group\":\"password\",\"attributes\":{\"name\":\"traits.name
.first\",\"type\":\"text\",\"value\":\"adsasd\",\"disabled\":false,\"node_type\":\"input\"},\"messages\":[],\"meta\":{\"label\":{\"id\":1070002,\"text\":\"First Name\",\"
type\":\"info\"}}},{\"type\":\"input\",\"group\":\"password\",\"attributes\":{\"name\":\"traits.name.last\",\"type\":\"text\",\"value\":\"asdasd\",\"disabled\":false,\"no
de_type\":\"input\"},\"messages\":[],\"meta\":{\"label\":{\"id\":1070002,\"text\":\"Last Name\",\"type\":\"info\"}}},{\"type\":\"input\",\"group\":\"password\",\"attribut
es\":{\"name\":\"method\",\"type\":\"submit\",\"value\":\"password\",\"disabled\":false,\"node_type\":\"input\"},\"messages\":[],\"meta\":{\"label\":{\"id\":1040001,\"tex
t\":\"Sign up\",\"type\":\"info\",\"context\":{}}}}]}}\n",                                                                                                                
    entity: Some(                                                                                                                                                         
        Status422(                                                                                                                                                        
            ErrorBrowserLocationChangeRequired {                                                                                                                          
                error: None,                                                                                                                                              
                redirect_browser_to: None,                                                                                                                                
            },                                                                                                                                                            
        ),                                                                                                                                                                
    ),                                                                                                                                                                    
}

Reproducing the bug

Make a post request with an already registered email address.

Relevant log output

No response

Relevant configuration

No response

Version

ory-client 1.6.1 with latest docker container

On which operating system are you observing this issue?

Linux

In which environment are you deploying?

Docker Compose

Additional Context

No response

Start by tracing update_registration_flow and the ResponseContent handling for an already registered email. Inspect how ErrorBrowserLocationChangeRequired is constructed and compare its entity with the response statuscode. Done means the empty status behavior is consistent and the reproduction no longer returns redirect_browser_to as None.