A GDScript call to:
`multiplayer.network_peer.some_prop = true`
seems to transalte to:
```
var temp = multiplayer.network_peer
temp.some_prop = true
multiplayer.network_peer = temp
```
Which caused the MultiplayerAPI to be resetted.
The call to set_network_peer is now ignored if the peer that's beeing
set is the same as the currently set one.