You are right, this is an inbound connection.
details in attached PCAP.
haproxy-stuck.pcapng.gz

What is strange here

1. after packet #2 must be TCP/ACK packet. This packet does not exist. We have a half-open TCP connection.
2. packet #7 has RST flag (client want reset connection), ACK - flag (connection established now), Sequence number: 1361 - the client sent data in unseen packets (this not received).
3. And there no more packets from the client.

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