GPS problem in Swimrun/Multisport with GPS 4.31, but not in 4.10?

My two first swimruns this year ended with one of the swim sahowing up as 1m, even though they are 170m. I am on GPS 4.31.

My wife has a Fenix 6 as well but she is on GPS 4.1, and she has not ended up with the same problem. Her open water swims looks way better.

How do I downgrade to GPS version 4.1 from 4.31?

https://connect.garmin.com/modern/activity/4977639323/2

https://connect.garmin.com/modern/activity/4971239415/6