Cannot Bind Socket reloading HAProxy 1.89 on IBM System i

Hi there, I’m having a hard time figuring out why I cannot reload HAProxy 1.89 compile by myself on AIX 7.2 and running on an ISeries 7.3 (IBM i is supposed to be AIX compliant through the PASE environment).

After I updated HAProxy from 1.62 (which gives me no problems running and reloading) to 1.89 I get this message:
Starting frontend_xxx cannot bind socket [0.0.0.0:80]
I’m actually soft reloading like this -sf $(cat /tmp/haproxy.pid).
Setting hard-stop-after didn’t help.

The strange thing is also that the same version of HAProxy on AIX 7.2 actually supports soft reload without a glitch.
Can somebody point me in the right direction to find a workaround or understand this behavior?