How to initialize a bus with a unit delay block?

I'm trying to initialize a bus from a unit delay block. I have created the following bus:

and defined a structure in the base workspace with the following code:

clear state
state = struct;
state.JulianDate = 2458773.91667;
state.Position = [6547.177196; 1754.310842; 0] * 1e3;
state.Velocity = [-1.744249; 6.509626; 3.659120] * 1e3;
state.Orientation = [0; 0; 0; 1];
state.AngularVelocity = [0; 0; 0];

If I use this structure for the "Initial condition" parameter of the unit delay block in the following model

where State In and State Out are explicitly set to be "Data Type: Bus: State", I get the following error:

I've followed the instructions on this page: https://www.mathworks.com/help/simulink/ug/specifying-initial-conditions-for-bus-signals.html but apparently I didn't get it right. What am I missing ?