In reply to Paul McWhinney:
The problem is specific to the gps chip the watch has and therefore doesn’t affect older Garmin watches which use a chip from a different manufacturer (Sony). It’s also why it doesn’t affect Suunto watches which still (afaik) use Sony chips. Not sure what the situation is with other brands like Coros.
So my Garmin Enduro (which is basically a Fenix 6) and my Suunto 9 are both fine.