https://bugs.winehq.org/show_bug.cgi?id=57041
--- Comment #6 from Andrew Nguyen arethusa26@gmail.com --- My own testing indicates that what makes SMath Studio not crash when hovering the mouse cursor over a toolbar item is to have a version of Wine Mono at least 9.1.0 installed in the Wine prefix. With a newer version of Wine Mono installed, the application will work with wine-9.0.
I'm inclined to mark this bug fixed as of (vanilla) wine-9.8, the first release with the default Wine Mono version bumped to 9.1.0.