with version 1.2.0 @data is not passed to the omniauth_external_window.html.erb

Nobody has claimed this yet.

Hi, first of all, let me say that I have been using devise token auth since 2017 and I have integrated various types of authentications (with regular username and pwd) and other custom omniauth strategies with success. I have been using this library to authenticate with various web client apps (ember, react) flawlessly. Now after all these years, I decided to update the version of devise token auth from `1.1.0` to `1.2.0`. I am on `rails 6.1.7.1`.

I have been running the current specs for my code base and out of 509 examples, it seems that I have only 1 spec failing; by having a look at what is going on, it seems that for some unknown reason, the spec is failing since the `response.body` for the callback response is an empty string and the `@data` coming from the ` render_data(message, data)` method in the `omniauth_callbacks_controller.rb` is not passed to the `omniauth_external_window.html.erb` view (as instead it was happening with version `1.1.0`). This is totally weird, since if I directly debug from inside `devise_token_auth` and I inspect what is going on in the ` render_data(message, data)` method my `@data` is there, here is an example of calling `@data.to_json` from the method

```
"{\"auth_token\":\"ABCDERWEEWWEFR\",\"client_id\":\"DAFAFDFDSFDSF\",\"uid\":\"123456\",\"expiry\":1684595450,\"config\":null,\"email\":\"user@email.com\",\"username\":\"username-123456\",\"fullname\":\"User name \",\"id\":1,\"created_at\":\"2019-12-18T13:48:54.252Z\",\"updated_at\":\"2023-04-20T15:10:50.346Z\",\"deleted_at\":null,\"invitation_token\":null,\"invitation_sent_at\":null,\"invitation_accepted_at\":null,\"invitation_limit\":null,\"invited_by_id\":null,\"invited_by_type\":null,\"invitation_created_at\":null,\"show_archived_experiments\":false,\"avatar\":null,\"url\":null,\"location\":null,\"laboratory\":null,\"show_archived_reagents\":false,\"show_tasks\":\"all\",\"provider\":\"idplus\",\"persistent_allow_password_change\":false,\"investigator_id\":null,\"show_archived_data\":false,\"allow_password_change\":false,\"investigator_lock\":null,\"inst_assoc\":\"INST\",\"indv_identity\":\"REG\",\"indv_identity_method\":\"U_P\",\"inst_assoc_method\":\"CSCREATED\",\"inst_acct_id\":\"1243423\",\"inst_acct_name\":\"Maintenance \",\"inst_acct_image\":\"http://domain.com/institution.JPG\",\"path_choice\":false,\"policy_success\":[\"urn:com:domain:idp:policy:product:indv_identity\",\"urn:com:domain:idp:policy:product:inst_assoc\"],\"message\":\"deliverCredentials\"}"
```

but to my great surprise, it seems that when I am redirected to `auth/provider/callback` page, this page is always empty, no js is executed (I tried to put a `console.log` in there to see if I could debug something from the view), I even tried to manually place some plain text in the body to understand if I could at least have the `@data` included in this page by using simple ERB but no matter what, this is always rendering an empty page: the `@data` is not passed to the view and the sign in is successfull, since if I inspect the current user, this user is signed in and authenticated to the rails app (the sign in count is updated in my db table) but the `@data` is not passed anymore in the view with version `1.2.0` as it was happening with version `1.1.0` and no js is executed, I am totally stuck on this and I do not understand if this has anything to do with the new changes in the version `1.2.0` or if this has something to do with the version of rails, has anyone by chance experienced this same type of issue with version `1.2.0` of devise token auth? Any kind of support on this would be highly appreciated, thanks in advance!

Reproduce the failing callback using omniauth_callbacks_controller.rb and the omniauth_external_window.html.erb view, starting with the render_data(message, data) path and the current failing spec. Compare the callback response behavior between versions 1.1.0 and 1.2.0; done means the callback response contains the rendered data and executes the expected view JavaScript without breaking sign-in.

Written by the indexing model from the issue text.