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Trying to use same keepalived conf from RHEL7 to RHEL8, with fwmark to keep same server for both 80/443 ports, real_server with 0 as port is no longer accepted

virtual_server fwmark 80 {
   delay_loop 5
   lb_algo sh
   lb_kind NAT
   protocol TCP
   persistence_timeout 3600

   real_server 192.168.17.31 0 {
      weight 1
      TCP_CHECK {
         connect_port 80
         connect_timeout 3
      }
   }

# keepalived -t
(Line 8) number '0' outside range [1, 65535]
(Line 8) Invalid real server ip address/port 192.168.17.31/0 - skipping

/usr/share/doc/keepalived/keepalived.conf.fwmark
lists real_server without port at all.

Doing that:
 keepalived -t
(Line 8) *** Configuration line starting `real_server` is missing a parameter after keyword `192.168.17.31` at word position 3

There is an issue on this:
https://github.com/acassen/keepalived/issues/1186
that mentions:
https://github.com/acassen/keepalived/commit/d98f07ceb85fc7de974e80e4122ab7a298cd4b42

This fix is included in the latest upstream release and therefore will be updated in RHEL 8.4.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (keepalived bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1927