Cut/Copy/Paste broken and inconsistent on Mac

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I've noticed some inconsistent behaviour with Cut/Copy/Paste (at least on Mac).
Let's start with the Edit menu which shows:
Cut ⌘X
Copy ⌘C
Paste ⌘V
If I highlight something and use the Cut shortcut (⌘X) it will beep (though it will not beep if I use the menu). Nothing will happen in either case and nothing will paste.
If I highlight something and use the Copy shortcut (⌘C) it will beep (seemingly indicating an issue), but it will copy and it will paste. Again, it will not beep if access through the menu.
In all cases, nothing is greyed out at any time from the Edit Menu (not context sensitive).
Looking at the Marking Menu (which is more context aware), shortcuts are shown with the CTRL modifier. This is incorrect as these shortcuts don't work at all using CTRL on a Mac.
Copy/Pasting within a sketch, pastes exactly on top.
However, Copy/Pasting from one sketch to another will result in the object being pasted but mirrorred in both axes around the origin.
Unless, that is, you deselect the object being copied before pasting into a new or existing sketch (as shown in SC below).
Now and from this point onward, Copy/Pasting will paste in same place (not mirrored) from one sketch to another.
Furthermore, if you Copy/Paste within a sketch but then ESC or Cancel, no copy will happen, as expected.
However, if you Copy/Paste from one sketch to another and then hit ESC or Cancel, a copy will in fact occur.