The forwarding VIP is to allow access to the real IP address for system admins and to allow the servers to get updates from the internet or other servers in the network. There is a single 0/0 forwarding VIP.
This is just a basic setup to test load balancing. This is for a customer of mine and they were testing some things b/c they were having issues with the forwarding VIP behaving correctly. Setting up the test bed and this issue popped up.
I have the same setup in my lab with the VE edition without the HA piece and it all works as expected. Talking to a fellow engineer, he was leaning towards a possible bug. Code is 11.2.1 HF7 I think.