Okay, you're welcome.
Another workaround might be to reverse the order in which the providers are invoked so that the internal provider is invoked before the LDAP authentication, like so:
<bean id="ldapAuthenticationManager" class="com.jaspersoft.jasperserver.api.security.externalAuth.wrappers.spring.JSProviderManager">
<constructor-arg index="0">
<list>
<ref bean="${bean.daoAuthenticationProvider}"/>
<ref bean="ldapAuthenticationProvider"/>
</list>
</constructor-arg>
</bean>
but I have not tested if it works.