Elixir-grpc can't receive stream response. Unexpected when waiting for headers-

Hi, I am trying to stream data to Google Cloud Speech-To-Text and receive a response but almost every request ends up with an error

%GRPC.RPCError{status: 2, message: "unexpected when waiting for headers: {:data, <<0, 0, 0, 0, 62, 42, 4, 50, 2, 8, 21, 50, 54, 10, 34, 10, 27, 32, 109, 97, 121, 98, 101, 32, 109, 97, 121, 98, 101, 32, 115, 111, 109, 101, 116, 104, 105, 110, 103, 32, 101, 108, 115, 101, 21, 57, 172, 96, ...>>}"}

or

%GRPC.RPCError{status: 2, message: "unexpected when waiting for headers: {:trailers, [{\"grpc-status\", \"0\"}, {\"content-disposition\", \"attachment\"}, {\"x-goog-ext-27651507-bin\", \"DbOLmjwVzczMPQ==\"}, {\"x-goog-ext-9650773-bin\", \"DUh68T8=\"}]}"}

The flow is more or less

    GRPC.Stub.connect(@service_url,
      cred: cred,
      adapter_opts: adapter_opts,
      adapter: GRPC.Client.Adapters.Gun,
      headers: %{
        "Authorization" => authorization_header(),
        "Content-Type" => "application/grpc"
      }
    )

    GRPC.Stub.send_request(stream, request)
    GRPC.Stub.recv(stream, timeout: timeout)

When I changed the adapter from Gun to Mint, the library crashes

[error] GenServer #PID<0.16840.0> terminating
** (ArgumentError) request with request reference #Reference<0.200553127.2209087489.150902> was not found
    (mint 1.4.2) lib/mint/http2.ex:765: Mint.HTTP2.get_window_size/2
    (grpc 0.6.0) lib/grpc/client/adapters/mint/connection_process/connection_process.ex:347: GRPC.Client.Adapters.Mint.ConnectionProcess.get_window_size/2
    (grpc 0.6.0) lib/grpc/client/adapters/mint/connection_process/connection_process.ex:205: GRPC.Client.Adapters.Mint.ConnectionProcess.handle_continue/2
    (stdlib 5.1.1) gen_server.erl:1067: :gen_server.try_handle_continue/3
    (stdlib 5.1.1) gen_server.erl:977: :gen_server.loop/7
    (stdlib 5.1.1) proc_lib.erl:241: :proc_lib.init_p_do_apply/3
Last message: {:continue, :process_request_stream_queue}