Same issue here (only records the starting point) and I also noticed that, ever since September 1st it had actually stopped recording GPS data entirely for my outdoor workouts. I only found out because the other day I forgot my phone home when I went out with my dog, and saw that nothing had been recorded. I even checked with RunGap. September 1st is when 13.7 came out, and I'm sure it's not a coincidence. Why it stopped entirely though is beyond me, as everything seems correct in the settings.
Now the problem is the same as everyone else is describing: it only records the starting point and no track, but at least it means that the GPS is being used. Hopefully it's all being stored on the watch and a future update to iOS can sync the missing data onto the phone.
For whatever reason, my phone is also missing a brief half-kilometer walk workout I did yesterday as a test: it just never got copied over. I really wish there were a way to manually "sync up" the Watch with the phone...