Ok, final update.
Eliminated everything that had to do with this VPN, interface, rules, etc.
Started all over, following all the steps, and everything is working as it should, without the manual routes.
By the way, if you run into the routing problem, you can change the "Gateway creation" to BOTH or to IPv4 ONLY and apply/save ont both server and client side(!)
That creates the new route.
Thanks all for your time and effort