I filed a support ticket about that, drives me crazy because my brain does quick math on the numbers and average speed uses elapsed time, but it’s not shown.
Usually my power numbers align between GC, TR, TP, WKO4, and GoldenCheetah. Had a recent ride where they did not, and GoldenCheetah agreed with something. Can’t remember exactly, it was a recent outside ride. Will look it up if you ask.