Win+number keys shortcut for grouped windows

Hey, very quick question:

Say I've got 3 windows of notepad open, and they're 4th on my taskbar. I want to open the third notepad window quickly with just the keyboard.

Holding windows key and pressing 4 expands the pile of notepad windows over the taskbar. I then feel I should be able to continue holding the windows key and press 3, but instead this just does the default Win+3 action.
Letting go of the windows key opens the default window from the notepad pile.
How can I quickly open the third window (without having to go through one by one with arrow keys or alt+tab or something)?

Cheers, Luke

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