When CMD-C, X, V, A, etc... is pressed while the keyboard is on Dvorak, it does not work as expected but goes back to the original Qwerty Keys

'C' for Dvorak maps to Qwerty I key, CMD-C is actually CMD-I
'V' for Dvorak maps to Qwerty . key, CMD-V is actually CMD-.
'X' for Dvorak maps to Qwerty B key, CMD-X is actually CMD-B

To get it working, CMD-'QWERTY-C' has to be used whilst on Dvorak.