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Does it output good value*S* or one single good value over and over? If the former, then..I just don’t know how to read this firmware. If the latter, then, no that’s what I expect.
3m is beyond the maximum expected transmission length for I2C, so, no, it’s not at all strange that it wouldn’t work over that long a distance. If you need that distance, you need to use RS485 or some other protocol. I2C is only really intended to work across very short distances. The limitation is based on the voltage ranges and the amount of signal loss over real wires. You might get lucky with some cables and configurations, but you shouldn’t expect it. RS485 can travel much farther because the voltage differences between the wires is much larger.