You will not always see an error code 24 with some O2 sensor faults as they will still generate a voltage within spec (upper and lower range), they just might be lazy, or biased towards the rich end (0.9V) or lean end (0.1V). The important thing the ECU reads is the average of the constant oscillation between high and low. You will often get an 'average' even if it's not the right one, or in the right place to give the correct fuelling.

What are you oscilloscope waveforms like? Can you post them as an image or video?

What makes you think that the O2 sensor is faulty? What symptoms are you noticing when riding/running the bike?

It's not impossible to get a low of 0.0V at the bottom of the amplitude in lean running, but it shouldn't drop much below 0.1V normally. In fact until the engine is warm, or rather the sensor is hot at around 300C, it will generate zero volts. If the heater element goes down in the sensor it will also struggle to give the right readings for the same reason.

If you have tried two sensors and they give the same results it could be the wiring loom or connector causing an open circuit in the heater circuit or a high resistance in the signal circuit which will cause lower/leaner readings than expected. Check continuity and resistance of the these circuits and the connector's condition.

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