https://bugs.winehq.org/show_bug.cgi?id=53114
--- Comment #20 from ryu.ketsueki@outlook.com --- A possible workaround for this issue on KDE side is being made. You can check the merge request here:
https://invent.kde.org/plasma/kwin/-/merge_requests/2651
What it appears to be happening is that WM gestures are being passed on to applications, which triggers the wine applications to terminate for not knowing what to do. Of course it is not a perfect solution, as we still have to figure out what is happening on Wine side but at least is an effort to prevent that from happening on Plasma, which does run as desktop mode for the Steam Deck. Now I don't know what can be done for this issue to be avoided on Gnome as well, at least for the time being. If someone has already reported it to Gnome devs, please post here.