Hi Qazik,
From our document, it is already mentioned that it needs to wait for the session age and then create the traffic logs.
So you may check and confirm if the session age or not you can use below command to check the session status.
If the session no age, there should no traffic logs.
display firewall session table detail

For more information, please refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100092598&id=EN-US_CLIREF_0178945159&lang=en

For more information, please refer to: https://support.huawei.com/hedex/pages/EDOC1100092598AEI07047/04/EDOC1100092598AEI07047/04/resources/admin/sec_admin_monitor_logrep_0030.html?ft=0&fe=10&hib=6.2.24.1.13.4&id=EN-US_TASK_0178928470&text=Traffic Logs&docid=EDOC1100092598
I hope it helps!