Auth0-react Universal Login losing custom params

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Environment is NextJS, CapacitorJS

I set custom params in the authorizationParams field of Auth0Provider:

<Auth0Provider
  {...auth0Config}
  authorizationParams= {{...auth0Config.authorizationParams, showIghBranding: "12", show_igh_branding: "13", showighbranding:"14"}}
  cacheLocation='localstorage'
  useRefreshTokens
>

And then use the following code to login:

await loginWithRedirect({
  async openUrl(url) {
    await Browser.open({ url, windowName: '_self' });
  },
});

The browser calls the authorize URL:
https://<redacted>/authorize?client_id=<redact>&scope=openid+profile+email+offline_access&redirect_uri=<redact>&showIghBranding=12&show_igh_branding=13&showighbranding=14&response_type=code&response_mode=query&state=<redact>&nonce=<redact>&code_challenge=<redact>&code_challenge_method=S256&auth0Client=<redact>

The Auth0 server then responds with a 302 redirect missing the custom params showIghBranding, show_igh_branding, or showighbranding

/u/login?state=<redacted>

Is it normal to lose the custom params at this redirect step? How do I ensure the custom params are kept?

I try to access the params in the universal_login.html page but get blank output:

        <b>config.extraParams.show_igh_branding:</b>{{ config.extraParams.show_igh_branding }}
        <b>config.extraParams.showighbranding:</b>{{ config.extraParams.showighbranding }}
        <b>config:</b>{{ config }}
        <b>config.extraParams:</b>{{ config.extraParams }}