Yes, this is a known issue of SONOFF CAM-B1P. The default 1080p H.265 video stream is too high for NSPanel Pro. According to my knowledge, it will be fixed by SONOFF (not NSPanel Pro) in December.
I confirmed this issue with SONOFF and replied in NSPanel Pro Roadmap and Co-Created Future - #21 by MichaelLearnsToCode on October 29th.
I’ll check with SONOFF again to see the latest progress.