Doesn't work saving attempt data through REST API Webservice (mod_quiz_save_attempt_data & mod_quiz_process_attempt_data).
Another functions like authentification or starting and finishing attempt are working normally.
And we have testing server on which all process of saving attempt data work correctly and industrial server at which this issue happened.
We've found any errors or warnings at moodle, httpd, postgres logs.
What can cause this problem?