Outdoor Run workout split alerts in km instead of miles in WatchOS 11

Since updating my watch to WatchOS 11 this week it has started giving me pace alerts every km whereas before it was providing them every mile, which is what I want.

On my phone in the Watch app I've gone to "Settings > Workout > Units Of Measure > Walking and Running Workouts" and it is still set to "Miles".

On the watch in "Workout > Outdoor Run > Preferences > Splits" it's set to 1km with no apparent way to change the units.

Additionally, during my running workout it now displays the distance on-screen in km when what I want is miles.

I've done all the shut down/restart nonsense to no effect. Does anyone have any idea how to fix this?