The iphone XS is already IOS13 and WATCH S4 is the Watch OS6
If you want to re-pair your watch, the following will happen.
1 Pairing is slow
2 The watch does not respond after the pairing is completed. The watch cannot be used. The watch settings cannot be entered. So i try restart the watch.
3 After restarting, the watch show need to re-pair.
this is a Endless loop
Tried to force watch to clear data and forced restart
and Try re-pair more than 10 times. Can't find any solution