I added logs to SystemExtension main as well as overrode init of FilterDataProvider, this is what i see
2023-10-31 15:19:14.128731-0700 0x169df Debug 0x0 9550 0 com.xxx.xxx.net: [scwx:netext] D Main P:09550 T:2080 "first flight " [main.mm:14]
2023-10-31 15:19:14.135417-0700 0x16a0d Debug 0x0 9550 0 com.xxxx.xxxx.net: [scwx:netext] D Main P:09550 T:7000 "FilterDataProvider init" [FilterDataProvider.mm:121]
2023-10-31 15:19:14.136349-0700 0x16a0d Debug 0x0 9550 0 com.xxxx.xxxx.net: [scwx:netext] D Main P:09550 T:7000 "IPC init start event listener" [FilterDataProvider.mm:138]
... [Hit disable via System Settings --> Network --> Filters]
2023-10-31 15:21:11.797161-0700 0x16e11 Debug 0x0 9550 0 com.xxxx.xxxx.net: [scwx:netext] D NetExt P:09550 T:f000 "stopFilterWithReason" 1 [FilterDataProvider.mm:196]
.... [Hit enable via System Settings --> Network --> Filters]
After this nothing happens, I do not see network extension being initialized