Arabic Script doesn't connect on SIGNS

The Arabic Script is connecting well in writable books, the GUI etc. But it doesn't work on signs/hanged signs in particular WHEN TYPING.{+}
{+}Even if i switch to the Arabic Language, it doesn't connect + it doesn't switch text direction (right to left instead of left to right).

This is weird considering that in writable books it works perfectly even though you don't have to switch to the Arabic Language.

These are the screenshots. As you see, when I am modifying or creating the signs it's bugged, but when i click "Done" it shows perfectly without any problem. But in the other hand, books work fine in both cases.

PS: I've tried to find any tickets that have the same problems, i didn't find any that mentions signs particularly, all of them are talking about GUIs in old snapshots ... I hope this will be fixed soon, it's very disturbing and it's slowing me in my projects