The web service function core_message_get_messages doesn't behave the same as in Moodle 3.4. When parameter "useridto" is 0, it returns all messages sent from the user specified in parameter "useridfrom" (as expected), but the list of returned messages all have the property "useridto" set to 0.

This regression breaks the use of messages in the Moodle Mobile with sites using Moodle 3.5.