Alpine Ski session: missing the vertical drop when upload logfile to Strava

I did 2 sessions of alpine ski using the dedicated 5x app.

everything was fine in recording but when the logfiles have been uploaded to Strava I could see all parameters of the session but no the vertical drop that was set in both cases to zero (!!?)

then through strava I could "calculate" the estimated vertical drop but the value calculated through Strava website was farily wrong compared to the vertical drop calculated by 5x.

This seems to be a recurrent bug for alpine ski session (no pbl. when I upload logfile of running and trial activities).

Anyone experienced this problem?