Currently working w/ Sonoma 14.5 3m USB 2.0 data cable purchased from amazon. No issues. Currently use an Atollo USB 3.0 10 USB A powered hub for combining USB A ports towards directed USB C ports.I've had this happen, as well - no hub in between the FM9 and my laptop (M1 MBP, Sonoma 14.3.1), just a two meter cable.
Caveat for both USB cables...be sure these are data cables, not just charging cables. Charging work great for charging devices, but bupkis for transmitting data, which we need. The powered hub does wonders for combining/connecting data or charging cables where your device may not have enough ports to connect all you'd need.I think you’ve misunderstood the spec. That length is just a recommendation to not use cables that exceed that length. It’s not some kind of performance requirement. There are just too many environmental factors to permit any kind of guarantee in the spec about length.