New Load Interface - Same Load in Multiple Queues?

I've got multiple rolling stock assets that have multiple load queues, each 1 item long. As such, I would like to load the same commodity into multiple load queues. Under the old system, this was easy to do. However, the new system does not seem to allow this. For example, in this screenshot, I've loaded the 'Cable Drum Load Empty 1' into the load_mid queue:

load1_by_wildnorwester_dk6jd3o-fullview.jpg


However, if I now change this load to be permitted in the 'load_front' queue as well, the option to add it is greyed out, even though the load_front queue is empty:

load2_by_wildnorwester_dk6jd3g-fullview.jpg


As such, how do I go about loading the same commodity into multiple queues using this new system?
 
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