Mouse X axis motion not working after updating from 4.24 to 4.26

For additional context, the game in question is Fade the First Chapter. In hopes of bringing more content and quality of life improvements to the game, I have copied it from 4.24 and upgraded it to 4.26. Everything appears to be working as intended, but for some reason when using a mouse, the X axis no longer moves. The control in play here is an xbox controller. The X axis still works fine on the controller and the y axis works on both input types. Are there any settings differences/ changes between version that would cause this issue, so I can resolve it and move forward with 4.26.