When I upload open water swimming sessions to Garmin Connect there is no longer a stroke chart. I have just updated my Forerunner 910XT to the new 2.50 firmware. Anyone else noticed this issue?
Unfortunately this seems to be a 910xt issue rather than Garmin Connect.
I've uploaded my workout to TrainingPeaks and there's no swim cadence information there either.
My initial testing indicates that if I power on and then change to swim then cadence is missing in GC. if I power on the watch in open water mode then swim cadence is reported. See if this works for you.