No traffic going to pool, but works with different name

I'm seeing an odd issue on our LTM where traffic will not flow to one of my pools. It's inside an irule, but the issue isn't with the rule itself. In a bit of desperation, I created a new pool which was the exact same as the problem pool, except with a '_Test' appended to the name. I updated the irule with the new pool name and traffic flowed as expected.

I then deleted the original pool, saved the config, re-created it, modified the irule with the original pool name and once again no traffic. The stats are 0's across the board for the pool, no traffic even attempting to go to it.

It seems odd that the name of the pool would matter, but I can't come up with any other explanation. Anyone seen something like this?

For what it's worth, I'm on 11.6.0 HF1

ltm pool /D04TS/DP_REST_FIREWALL_Servers {
    members {
        /D04TS/DP-1:8149 {
            address X.X.X.X
        }
    }
    monitor /Common/gateway_icmp
}

ltm pool /D04TS/DP_REST_FIREWALL_Servers_Test {
    members {
        /D04TS/DP-1:8149 {
            address X.X.X.X
        }
    }
    monitor /Common/gateway_icmp
}