QBluetoothSocket never signals readyRead & readChannelFinished

I set up a connection to an android device. The device transfers data using a RfcComm connection. The transfer succeeds (on Android), but usually, it fails on the Desktop (Bluez backend).

The connection fails with this error:

qt.bluetooth.bluez: void QBluetoothSocketPrivate::_q_readNotify() 19 error: -1 "Connection reset by peer"

Manually connecting QBluetoothSocket::disconnected to QBluetoothSocket::readyRead and QBluetoothSocket::readChannelFinished fixes the issue. My (badly informed) guess would be that there's still some data to be read, but the "connection closed" gets processed without reading the remaining data.