Select/Add iddle engineers hotkey is not working as expected

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When i press the Select/Add iddle engineers hotkey with an Air Transport previously selected it deselects the transport and just select the engineers. I need a fast way to select mi transport and then add some enginers to the selection to fast transport them, but this hotkey is not working as expected.

In this video u can chekc what im trying to do:
8890297a-3fb9-4916-8ae7-86df8cf18418-ForgedAlliance_vQBTLmWTXD.zip