I just did a longer 4 hour test with the 4.36.11.8391 firmware. Yesterday, I turned off the network at 11pm and turned it back on at 4:37am. No problem with the footage and I can play it all back within the app.
Since they paused the beta roll out, I had to test with my four V3 cameras that had the beta firmware already on my main network. I turned off the network at 5:10am and turned it back on at 7:10am. I am only able to view the playback footage until 5:45am in the app. This beta is confirmed to be a bug. I am going to report this in the 4.36.12.9357 beta thread.