TFS 1.X+ Roof borders stack order

[Manigold]

I'm using tfs 1.2 and this little problem is very annoying, would anyone know how to solve?(same items.otb in server and map editor)

 

[Chriistian.L.B]

Items.otb, roof border is always on top (item attibute flag)

 

[Manigold]

In fact, after doing some testing here, just changing the wooden border from border to common in tibia.spr, and changing the stackorder from border to none in otbeditor solved the problem. But I don't know if it's the best solution, because that would force players to download the edited client spr to avoid client crashs.
Can anyone suggest another solution?