Poor VoWiFi outgoing traffic with 5GHz WiFi and WMM enabled

I use the last version from git - Powered by LuCI Master (git-19.320.62752-13e9e3e) / OpenWrt SNAPSHOT r11530-7a7610c21b
The router is DLink DIR-860L B1

I have very poor VoWiFi (Wi-Fi calling) outgoing traffic when I use 5GHz WiFi with WMM enabled(with disabled WMM the outgoing traffic is good but very low WiFi speed due the 802.11n and 802.11ac limitations).
The problem is here the last month because before October has good. Maybe problem with big mac80211 update...

How I can change the settings of WMM manually ?

Any help, please?... :frowning: