Transfer between external servers

I'm using Mi3, Android phone

As we all know, there's a lot of MCPE external servers owners uses transfering method to transfer players from a server to another server. Especially servers with 300+ slots... massive servers

However, in MCPE 0.12.1 there's a bug:
When player transfered from server A to server B, it won't disconnect the connect between the server A and player, which makes that player online on both server at the same time...

Please fix this as soon as possible