SQLException: Deferred enlistment not supported

Describe the bug

More already here: https://groups.google.com/g/quarkus-dev/c/gVffENNZPiU

Expected behavior

Like 1.12.2.Final - no error

Actual behavior

SQLException: Deferred enlistment not supported

To Reproduce

@Dependent
@Path( USER_ENDPOINT )
@Authenticated
public class UserEndpoint implements UserApi {

    @Inject
    UserService userService;

    @GET
    @Consumes( MediaType.APPLICATION_JSON )
    @Produces( MediaType.APPLICATION_JSON )
    @Path( GET_USER_FROM_EMAIL )
    public ResponseDTO<UserDTO> getUserFromEmail( @QueryParam( value = "email" ) String email )
            throws UserNotExistingException {
        return ResponseDTO.of( userService.getUserByEmail( email ) );
    }
}

@ApplicationScoped
@Transactional( Transactional.TxType.REQUIRED )
public class UserService {

    @Inject
    UserMapper userMapper;
    @Inject
    CurrentUserProvider currentUserProvider;
    @Inject
    KeycloakService keycloakService;
...

    @Transactional( Transactional.TxType.NOT_SUPPORTED )
    public UserDTO getUserByEmail( String email ) throws UserNotExistingException {

        Optional<UserRepresentation> keycloakUserOpt = keycloakService.findUserByEmail( email );
        if ( keycloakUserOpt.isEmpty() ) {
            throw new UserNotExistingException( "User with email <" + email + "> not registered in keycloak.", null );
        }

        UserRepresentation keycloakUser = keycloakUserOpt.get();

        try {
            User user = userDao.findByKeycloakUsername( keycloakUser.getUsername() );
            return userMapper.mapFullUser( user, email );
        } catch ( NoResultException e ) {
            throw new UserNotExistingException( e.getMessage(), e );
        }
    }
}

@ApplicationScoped
************************************************************************************************
THIS CODE DIFFERS FROM VERSION 1.12.2.Final to 1.13.4.Final. In 1.13.4.Final I had to remove this following line. In 1.12 it was working with this:**
@Transactional( Transactional.TxType.REQUIRED )
************************************************************************************************
public class UserMapper {

    @Inject
    FeatureMapper featureMapper;
    @Inject
   ...

    public UserDTO mapFullUser( User user ) {
   return userDTO;
}
}

Configuration

# portal settings
portal.send-verify-email=true
%dev.portal.send-verify-email=false

quarkus.mailer.from=noreply@URL.at
quarkus.mailer.host=Host
quarkus.mailer.port=465
quarkus.mailer.ssl=true
quarkus.mailer.username=username
quarkus.mailer.password=Password
quarkus.mailer.mock=false

# Logging
quarkus.log.level=INFO
#%dev.quarkus.log.level=DEBUG
#%dev.quarkus.log.min-level=DEBUG

# datasource settings
quarkus.http.port=8180
quarkus.http.limits.max-body-size=20240K
quarkus.datasource.jdbc.url=jdbc:postgresql://localhost:5432/portal
quarkus.datasource.db-kind=postgresql
quarkus.hibernate-orm.database.default-schema=public
quarkus.datasource.username=username
quarkus.datasource.password=password
quarkus.datasource.jdbc.min-size=2
quarkus.datasource.jdbc.max-size=8
quarkus.hibernate-orm.database.generation=update
quarkus.package.type=uber-jar
# Rest-api settings
my-api/mp-rest/url=http://localhost:8080/
my-api/mp-rest/scope=javax.inject.Singleton
org.eclipse.microprofile.rest.client.propagateHeaders=Authorization
# flush mode hibernate
# OIDC Configuration
keycloak.url=http://localhost:8280/auth/
## general
keycloak.clientId=admin-cli
quarkus.oidc.client-id=quarkus-portal
keycloak.realm=myrealm
keycloak.username=myrealm
keycloak.password=myrealm
quarkus.oidc.auth-server-url=http://localhost:8280/auth/realms/myrealm
quarkus.oidc.token.issuer=https://URL/auth/realms/myrealm
quarkus.oidc.credentials.secret=CREDENTIALS
## Scheduler Automatic Remove of MP3 files. Jeden Monat am 1sten um 02:15am
cron.expr=0 15 02 1 * ?
## Scheduler Automatic Remove of alten Angeboten. Jeden Monat am 1sten um 03:15am
cron.expr2=0 15 03 1 * ?
# Enable Policy Enforcement
quarkus.keycloak.policy-enforcer.enable=false
# Dev variables
%dev.quarkus.hibernate-orm.log.sql=false

quarkus version 1.13.4.Final