esp_wifi_mesh: fix the issue that layer2 node connect to lower-layer node when FIXED-ROOT root disappeared(backport_v4.2) See merge request espressif/esp-idf!15730
esp_wifi_mesh: fix the issue that layer2 node connect to lower-layer node when FIXED-ROOT root disappeared(backport_v4.2) See merge request espressif/esp-idf!15730