Another related question: are there two logical channels in the
background of TCP, one for sending the actual data and one for
signalling the close? Otherwise I cannot explain myself why the data
doesn't arrive but the close does.

There is only one channel. Actual data and signalling are using the same physical medium and are using the same packets. There are a number of headers in the packets which makes the distinction.

The author of the freeware multi-tier middleware MidWare
The author of the freeware Internet Component Suite (ICS)

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