I started a XPZ campaign (latest build) and updated to "Extended-7.11.8-e9cde97c1-2024-02-18-win64.7z" version.
When I'm on the soldiers ("hands on deck") screen and I scroll at anywhere but the vertical scroll bar or triangle up/down markers, instead of scrolling the screen, the game selects a soldier. If the wheel was scrolled up the soldier selected is the one where the mouse pointer was. If the wheel was scrolled down, the soldier selected is three positions down where the pointer was. The same behavior is observed from the training screen.
I don't recall this being the case in previous OXCE builds. I tested it with XCF, and a fresh copy of xcom1 to be sure and same thing.
Maybe I'm missing on some setting in options.cfg that changed between the past few versions?