Hello @zooropean and welcome to the community. I have not tinkered with RTSP so i am not 100 percent sure, but i know on the regular firmware the camera must connect to the internet once after power is restored before it will record anything to the SD card. So it may be that it must connect once before it will start to record via RTSP also. Hopefully someone who uses that version of the firmware can chime in and correct me if I’m wrong.
Your only real hope at the moment is 3rd party firmware (mainly Dafang Hacks, if it works on the V3 yet). Wyze has shown no sign of making its own RTSP firmware less dependent on phoning home. (This is largely because their own RTSP firmware also supports their regular cloud and P2P services.)
I think we would benefit from Wyze addressing this undocumented internet requirement for their RTSP firmware.
I and several others out there have done extensive testing and have confirmed that there is an attempt to reach Wyze’s servers and if it can’t (which a plenty of RTSP firmware users are not allowing/or even have an active internet connection for the camera) then it will do a soft reboot and you’ll lose your camera connection for about 15 seconds and this happens every 1-2 minutes.