Javascript error thrown when invalid form submitted with Turbo 8

[drale2k]

When i submit a form with Turbo 8 which fails validation, the reponse HTML is never being rendered and therefore it never shows the flash message. In the console i see the following JS error:

application-b9e71096aae4f733eadbb4e41a123b1da85256271b1795ab26fc5016dc57c22e.js:38172 
                
POST https://mydomain.com/tasks 422 (Unprocessable Content)

fetchWithTurboHeaders @ application-b9e71096aae4f733eadbb4e41a123b1da85256271b1795ab26fc5016dc57c22e.js:38172
perform @ application-b9e71096aae4f733eadbb4e41a123b1da85256271b1795ab26fc5016dc57c22e.js:38279
await in perform (async)
start @ application-b9e71096aae4f733eadbb4e41a123b1da85256271b1795ab26fc5016dc57c22e.js:38482
submitForm @ application-b9e71096aae4f733eadbb4e41a123b1da85256271b1795ab26fc5016dc57c22e.js:40100
formSubmitted @ application-b9e71096aae4f733eadbb4e41a123b1da85256271b1795ab26fc5016dc57c22e.js:41497
submitBubbled @ application-b9e71096aae4f733eadbb4e41a123b1da85256271b1795ab26fc5016dc57c22e.js:38700

which points to this function

function fetchWithTurboHeaders(url, options3 = {}) {
  const modifiedHeaders = new Headers(options3.headers || {});
  const requestUID = uuid();
  recentRequests.add(requestUID);
  modifiedHeaders.append("X-Turbo-Request-Id", requestUID);
  return nativeFetch(url, {
    ...options3,
    headers: modifiedHeaders
  });
}

My code

Given the following controller create action

def create
    @task = Task.new(task_params)
  
    if @task.save
      redirect_to tasks_path, notice: "#{@task.name} was created."
    else
      flash.now[:error] = @task.errors.full_messages[0]
      render :new, status: :unprocessable_entity
    end
  end

with model validation

validates :name, presence: true

and the form

<%= form_with model: @task do |f| %>
  <div class="row">

    <div class="col-12 col-md-6">
      <div class="form-group">
        <label class="form-label">
          Name
        </label>
        <%= f.text_field :name, class: "form-control" %>
      </div>
    </div>
<% end %>

The issue occurs if i submit the form while leaving the name blank. Using render :new, status: :see_other instead, gets rid of the error but the HTML is still not being replaced and therefore the flash message not shown