Hi both, I checked this yesterday on-ground.  Clearly the way it was mapped was wrong (no ford, and it indicated foot=yes and bicycle=yes which is just dangerous!).  Maybe you can cross here by horse during summer/low water, but I'm pretty sure yesterday you would have killed the horse.  My personal preference would be to more or less leave it as is now (i.e. leave the ways unconnected, maybe adding a noexit tag to the highway=service, and modifying the path into a bridleway).  Another option would be to still reconnect both ways, but then it must be very clear that this is _only_ for horses (and during summer I presume).  And then again, you can cross the Lesse with your horse at any place during summer, right?  What's your preference?