[Bug] ctrl+alt+shift as hotkey-modifier does not work

[Steam, latest version as time of writing, Windows 10]

Made a video showing it off. Well… showing that something does not happen, anyway.
The stupid horse yet lives. ctrl+alt+shift+w for “delete unit” is not something I’m actually interested in.
But I need ctrl+alt+shift+1 to 5 and ctrl+alt+shift+F1,F2,F3,F5 for productively working with all twenty control groups. So please consider this a somewhat critical issue.