Up to this point, every weapon has had at least 3 different sheathed positions to prevent clipping.
There's the normal version, the mounted version, and the seated version. Even Reaper from the last expansion had this, but Viper doesn't. When mounted or seated, the swords remain exactly the same and just clip into everything.
This feels incredibly lazy. I haven't picked up Pictomancer, but I'm assuming it's probably the same.