default or selected kernelversion does not have config value CONFIG_MAC80211_VERBOSE_MESH_SYNC_DEBUG.
Result is shown for kernelversion 5.15.31

Verbose mesh mesh synchronization debugging

configname: CONFIG_MAC80211_VERBOSE_MESH_SYNC_DEBUG

Linux Kernel Configuration
└─>Networking support
└─>Wireless
└─>Select mac80211 debugging features
└─>Verbose mesh mesh synchronization debugging
In linux kernel since version 3.5 (release Date: 2012-07-21)  
Selecting this option causes mac80211 to print out very verbose mesh
synchronization debugging messages (when mac80211 is taking part in a
mesh network).

Do not select this option.