[SMP][1.73]Can't middle-click CommandComputer

I am in my creative server (I am OP) and I placed a CommandComputer to use GPS host (with the new GPS update). I ran "label set Host" but I can't middle-click them, so I do it and it doesn't appear on my inventory.

You've probably figured this out, but a workaround would be to break and replace the system. In creative mode, this will result in a computer in your inventory and in the world, both with the same label.