I have this issue on a new Katana GF66 12UCO, Windows 11 Home. Firstly, let me describe the issue as I have experienced it in practice. When editing text, I sometimes had a need for multiple undos, so I held the (left) Ctrl+Z key combination. Strangely, this did only one undo, and then started inputting a string of zs (lower case). Even more strangely, the right Ctrl, when pressed alongside Z, behaved normally (as desired, it rapidly performed many undos).
I investigated the behavior with Keyboard Checker and found that, when I pressed the left Ctrl, and then the Z key, pressing the Z key released the left Ctrl key, which explained the z string. Also, this behavior is unique to that exact physical key. For example, on an American layout, my keyboard would start inputting ys because that’s the character mapped to this physical key on that layout (tested).
I hope this is not a hardware issue. I am skeptical about using custom MSI software because, from my experience, some of their modded drivers actually cause incorrect functionality (for example, the pre-installed MSI drivers for Intel Iris Xe cause occasional graphical glitches, which is fixed by downloading the drivers via Intel Driver & Support Assistant). Thank you for your help.
Edit 1. I have not tested the keyboard behavior on Linux yet. I will do so as soon as I get my hands on something which can be turned into bootable media. If the issue persists there, then I am afraid MSI really did mess up the keyboard design.
Edit 2. I confirmed that the Z key does the same thing to the left Shift key (but not the right one!) when pressed down alongside it: it deactivates/releases it. The same goes for the Alt key.
