sendme closes client connections
Since upgrade to nightly (0.4.1.1-alpha-dev-20190523T134010Z-1~d90.stretch) connections are closed regularly after short data transfers (even irssi via ssh):
Connection to ... closed by remote host.
[info] sendme_process_stream_level(): Unexpected stream sendme cell. Closing circ (window 500). [info] command_process_relay_cell(): circuit_receive_relay_cell (backward) failed. Closing.
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