TDA uploaded wrong avg speed to GC (Hypersonic speed!)

Hello, I've done a workout from the cycling plans in the garmin connect website:

"Garmin Connect website > Training Plans > Gran Fondo"

I created the plan and it loaded in my calendar... went into TDA and ran the first planned workout for the day: "Zone 2 Aerobic" (1hr in Z2).

Using Neo 2t latest firmware on TDA (Windows 11).

All worked perfectly while doing it. Then it uploaded. And now GC is showing an AVG speed of 42882km/h...

I am in Italy and the account is all set in metric units. I already did other workouts using the TDA app and never happened. But it's the first time trying these Garmin Connect plans.

  • Is there a bug in metrics conversion on workouts imported from Connect training plans when ran from TDA or what?

I double checked EVERY setting on both GC and the tacx TDA app, nothing wrong. Tried switching between dot/commas for decimals but nothing changed.

Screenshot from tda app (android app here just for convenience), look at the AVG speed:

but the real correct speed was stored in Connect if you look into the analysis:

so must be something it did at the end of the workout when uploading the workout stats.

I would like to send more data to the devs, but don't know what's the email/contact for these kind of software issues.