Fenix 6 pro GPS accuracy ruined after update 26.00

The update to 26.00 completely ruined GPS. Before update the GPS line was smooth, but after the update GPS line seems to be jumping around all the time. In addition to that it takes a very long time to get the GPS signal. And note that there are no tall buildings or some other things that could ruin the GPS signal. I've been running the same routes for several years with no GPS issues until now. 

Here's a list of things I tried and did not work:

* reset the watch back to factory settings

* Try different modes: only GPS, GPS+glonass, GPS+galileo

The watch is synced to my phone, so it must have the latest gps data.

I have no Idea what I could try next.

Here are the before and after screen shots of the same route. The wobbling of the route adds something like 200-300 meters to every kilometer.

Before update

After update