Yeah unfortunately this problem was reported as early as March 2023 AFAIK. According to SlabSlayer’s finding on Dec 7 2023, it will only record exactly 30 min after internet access is lost.
It wasn’t until Jan 6 2024 WyzeJasonJ post which mentioned the following:
We don’t know if it gets automatically overwritten after some time. Unfortunately, I don’t have Wyze OG Cam on hand so I can’t personally test this. Furthermore, I doubt there will be fix for this because I believe they used a different supplier for Wyze Cam OG so this is very likely part of their core programing in the firmware. Wyze Cam V3 and Wyze V3 Pro don’t have this problem.