Open Water Swim - f7x ss - Breaststroke with full GPS Signal gives no course

Tried several times breaststroking with different settings but always there is no course recorded but with full GPS all the time (data field GPS shows always all 5 Bars in Blue)

1. Try with nearly the same settings as my old f5x (GPS+Galieo / intelligent recording) - GPS All Systems + intelligent recording - only 50-100m course recorded - 200m in summary

2. Try GPS All Systems + Multiband + intelligent recording - only 50-100m course recorded - 1000m in summary

3. Try GPS All Systems + Multiband + recording every second - only a few meters course recorded - 600m in summary

1st try

2nd try

3rd try

Questions:

Why isn't there any course recording for the full activity?

Where does the full lenght of the activity comes from?

In all of the recorded fit files location data is missing after a while and didnt come back

With my fenix 5x there it was always possible to record breaststroke swimming or the whole track

Maybe someone or   can give an answer or maybe forward this issue to the development?

Thanks