The canal path was always *ahem* 'interesting' on 23s. But doable.
At some point early last year the surface was 'improved'.
Only it wasn't.
It has been rendered virtually unrideable on 23s.
I say virtually, because I took Mice down there, when I didn't know about the new surface, and was thoroughly embarrassed for having done so.
Although we did manage to complete the canal path, it was a total 'mare, and I wouldn't recommend anything less than an ATB with knobblies down there.
Ask Mice. Her MMV.