The same here. As far as I can see, the reply packets are silently dropped, 
while the internal host replies to the incoming connection.  

## trying to connect to 192.168.75.90 port 80
i...@client:~$ telnet 192.168.75.90 80
Trying 192.168.75.90...

## snooping external interface at firewall/router: 
i...@fire:~$ pfexec snoop -d ext90 -r port 80
Using device ext90 (promiscuous mode)
192.168.72.50 -> 192.168.75.90 HTTP C port=56044 
192.168.72.50 -> 192.168.75.90 HTTP C port=56044 
192.168.72.50 -> 192.168.75.90 HTTP C port=56044 
192.168.72.50 -> 192.168.75.90 HTTP C port=56044 

## snooping internal interface at firewall/router: 
i...@fire:~$ pfexec snoop -d int11 -r port 8080
Using device int11 (promiscuous mode)
192.168.72.50 -> 10.4.4.11    HTTP (proxy) C port=56044 
   10.4.4.11 -> 192.168.72.50 HTTP (proxy) R port=56044 
192.168.72.50 -> 10.4.4.11    HTTP (proxy) C port=56044 
192.168.72.50 -> 10.4.4.11    HTTP (proxy) C port=56044 
   10.4.4.11 -> 192.168.72.50 HTTP (proxy) R port=56044 
192.168.72.50 -> 10.4.4.11    HTTP (proxy) C port=56044 
192.168.72.50 -> 10.4.4.11    HTTP (proxy) C port=56044 
   10.4.4.11 -> 192.168.72.50 HTTP (proxy) R port=56044 
192.168.72.50 -> 10.4.4.11    HTTP (proxy) C port=56044 
192.168.72.50 -> 10.4.4.11    HTTP (proxy) C port=56044
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