Can you or your testing colleague quickly verify the issue by using the Keyboard Test Online website (such as https://keyboard-test.space)? When pressing the 'Tab + W + Space' keys simultaneously, the corresponding key color on the website should turn green. we have already tested this issue on iMac 13.3.1/Mac Pro 12.6.6/M1 and have found that it does not work(no space key event)

NKRO refers to the number of keys a keyboard can support being pressed simultaneously, my M1 computer can support up to six keys being pressed simultaneously, which has been verified using Online Key Rollover tool, However, it is strange that when pressing the 'Tab + (w/s/x) + Space' 3 keys simultaneously, there is no Space event.