Thanks Winand - Indeed a spinning rear wheel with magnet is required for that speed calculation, however I was probably unclear.
Like Don, I’ve been removing the cadence sensor from the speed area before each ride because I was concerned that my speed would be reported as zero. In other words, I suspected it was a bug.
Glad to hear it makes no difference, so I’ll just leave it.
However, if a fixed-wheel trainer is used, technically the speed section should not be populated, or perhaps greyed out. I think this would mitigate some of the confusion/concern a few of us have had.