My Apple Watch 5 does not allow me to name my workout when I use ‘other’ in workouts

Yes it's because that option has been removed in watchos6,what you need to do now is go into the workout app on the watch and scroll down to the bottom and tap "add workout" when you do this a very long list of workouts appear and the idea is that if your workout name isn't there then you choose one that's closest to the one you want.