I don't believe Command/Crl+Click has ever worked for Groups. I believe you are mis-remembering. It works for layers or smart objects, but never "groups".
There is a somewhat hidden shortcut though which can load the alpha as a selection. This may get around the fact that there's no direct "click" method.
With only the group visible, you can hold the Command/Ctrl and Option/Alt keys and hit the 4 key. This will load visibly transparent areas as a selection.
This shortcut is essentially a Channels Panel shortcut. So it "sees" what channels see. Just turn off visibility for everything except your Group. To do that merely hold the Option/Alt key down and click the Visibility icon next to the group in the Layers Panel.
So, to sum it up...
Hold Option/Alt and click the Visibility icon next to the Group in the Layers Panel
Hold Command/Ctrl+Option/Alt and hit 4
Hold Option/Alt and click the Visibility icon next to the Group in the Layers Panel again
- Hides all other layers
- Selects alpha based upon what is visible
- Shows all layers again
You can also click the Selection icon at the bottom of the Channels Panel rather than using the
Command/Ctrl-Option/Alt-4 shortcut. Or.. just hold Command/Ctrl and click the CMYK/RGB Channel thumbnail on the Channels Panel -- that will also load transparency as a selection.
I should also point out that white can be problematic. Because this is a Channels shortcut, and on channels white is equivalent to transparency, all white will be seen as transparent and therefore not part of any selection. White will not be seen. If you have white pixels in the artwork, you may need to combine selection methods to get all visible pixels, including white, to be part of (or absent from) any selection.