RHEL 10 gateway stopped allowing ping from internal lan to the upstream lan

I'd set up a highly available default router using 2 RHEL 10 instances which maintained a floating virtual IP with keepalived.

It all worked well until an OS update a few weeks back. After that update, internal hosts could still access the internet, but could not access any of the IPs of the lan on the other side of the gateway.

As a data point, I set up a single RHEL 10 instance as the default gateway, and everything worked as expected.

So, at this point, it looks like RHEL 10 isn't playing nice with keepalived virtual ips. Is there some other redhat-approved solution for a high availability service using a floating IP?