Apple Watch 3 elevation data missing

Hi, When tracking workouts like cycling or running with the Apple Watch 3 workout app I see that elevation data is not always recorded and visible in the workout app afterwards. Last Sunday I did a mountainbike Ride with 208 m elevation and it didn’t show in my workout summary. Anyone know why and how to fix it? Since Apple Watch 3 should track elevation it should be in there when using the watch without the phone? I did add it to the metrics for the workout but not in the summary afterwards. Thanks, Joost