[SOLVED] Keycloak Custom Registration Flow Fails with "KC-SERVICES0013: Failed authentication: java.lang.NullPointerException" Error

I am following this guide and trying to create my custom registration flow in Keycloak using two forms and custom templates. Below I am providing the code of the authenticator factory for the first form. The second form uses the same code with the only changes that taking place are the PROVIDER_ID, getDisplayType() method and the return type of the render() method which is form.createForm("register2.ftl");. The Keycloak version I am using is 24.0.1.

I have:

Build my application and copied the JAR file into providers folder
Added my custom .ftl template files into the themes folder
Executed the command bin/kc.bat start-dev --debug
Used --debug in order to expose the debug port and then use breakpoints in my application

public class FirstCustomFormAuthenticatorFactory implements FormAuthenticatorFactory, FormAuthenticator  {

    private static final String PROVIDER_ID = "register-form1";
    private static final AuthenticationExecutionModel.Requirement[] REQUIREMENT_CHOICES = {
            AuthenticationExecutionModel.Requirement.REQUIRED
    };

    @Override
    public String getDisplayType() {
        return "Registration Form 1";
    }

    @Override
    public String getReferenceCategory() {
        return "";
    }

    @Override
    public boolean isConfigurable() {
        return false;
    }

    @Override
    public AuthenticationExecutionModel.Requirement[] getRequirementChoices() {
        return REQUIREMENT_CHOICES;
    }

    @Override
    public boolean isUserSetupAllowed() {
        return false;
    }

    @Override
    public String getHelpText() {
        return "";
    }

    @Override
    public List<ProviderConfigProperty> getConfigProperties() {
        return List.of();
    }

    @Override
    public FormAuthenticator create(KeycloakSession keycloakSession) {
        return this;
    }

    @Override
    public void init(Config.Scope scope) {

    }

    @Override
    public void postInit(KeycloakSessionFactory keycloakSessionFactory) {

    }

    @Override
    public void close() {

    }

    @Override
    public String getId() {
        return PROVIDER_ID;
    }

    @Override
    public Response render(FormContext context, LoginFormsProvider form) {
        RegisterBean rb = new RegisterBean(new MultivaluedHashMap<>(), context.getSession());
        form.setAttribute("register", rb);
        return form.createForm("register.ftl");
    }
}

Keycloak server starts without any errors. Afterwards:

I go to http://localhost:8080/admin/myRealm/console
I begin the registration flow of the first form by entering the credentials needed

When submitting the form I am getting the next error:

KC-SERVICES0013: Failed authentication: java.lang.NullPointerException: Cannot invoke "org.keycloak.authentication.FormAuthenticator.render(org.keycloak.authentication.FormContext, org.keycloak.forms.login.LoginFormsProvider)" because "this.formAuthenticator" is null
        at org.keycloak.authentication.FormAuthenticationFlow.renderForm(FormAuthenticationFlow.java:307)
        at org.keycloak.authentication.FormAuthenticationFlow.processFlow(FormAuthenticationFlow.java:285)
        at org.keycloak.authentication.DefaultAuthenticationFlow.processSingleFlowExecutionModel(DefaultAuthenticationFlow.java:377)
        at org.keycloak.authentication.DefaultAuthenticationFlow.processFlow(DefaultAuthenticationFlow.java:246)
        at org.keycloak.authentication.DefaultAuthenticationFlow.processAction(DefaultAuthenticationFlow.java:133)
        at org.keycloak.authentication.AuthenticationProcessor.authenticationAction(AuthenticationProcessor.java:987)
        at org.keycloak.services.resources.LoginActionsService.processFlow(LoginActionsService.java:364)
        at org.keycloak.services.resources.LoginActionsService.processRegistration(LoginActionsService.java:724)
        at org.keycloak.services.resources.LoginActionsService.registerRequest(LoginActionsService.java:780)
        at org.keycloak.services.resources.LoginActionsService.processRegister(LoginActionsService.java:758)
        at org.keycloak.services.resources.LoginActionsService$quarkusrestinvoker$processRegister_707378c0de357d574c0a2e1d6056afe7606ab5ff.invoke(Unknown Source)
        at org.jboss.resteasy.reactive.server.handlers.InvocationHandler.handle(InvocationHandler.java:29)
        at io.quarkus.resteasy.reactive.server.runtime.QuarkusResteasyReactiveRequestContext.invokeHandler(QuarkusResteasyReactiveRequestContext.java:141)
        at org.jboss.resteasy.reactive.common.core.AbstractResteasyReactiveContext.run(AbstractResteasyReactiveContext.java:147)
        at io.quarkus.vertx.core.runtime.VertxCoreRecorder$14.runWith(VertxCoreRecorder.java:582)
        at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2513)
        at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1538)
        at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:29)
        at org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:29)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:857)

I am not entirely sure what's causing the issue, as seen in my logs. Do you have any suggestions aa what I am doing wrong?