Regarding Observation 4872408 …
Can anyone see a trace on this waterfall which was auto classed as Good? And there was one short line of data interpreted. Is it strange or is it …?
Nope, the demodulated frame is a noise frame. It happens from time to time some noise frames to pass the crc check of the protocol. In this case, as set by default, for this mode if there are data the observation has status good, but if you properly vet the waterfall then it turns bad.