Iris - Subobjects marked COND_InitialOnly not replicated

When adding replicated subobjects to the registered subobjects list, you can set replication conditions to control how the subobject is considered for replication.
Without Iris enabled, a COND_InitialOnly subobject will only have its initial replicated state sent. However, with Iris enabled, a subobject with this condition does not appear to be replicated to the client at all.
It also seems as though FObjectPoller::PushModelPollObject is still called for the object on every update, despite only needing to replicate its initial state.

With Iris enabled, have the server create a replicated subobject and add it to the owning actor's registered subobject list, setting the replication condition to COND_InitialOnly:
    AddReplicatedSubObject(MyTestSubobject, COND_InitialOnly);

Observe the subobject will not exist on the client.