https://bugs.winehq.org/show_bug.cgi?id=48151
--- Comment #6 from Timur ttyusupov@gmail.com --- I've attached logs from two scenarios: 1) Entering Cyrillic letters using "Russian - PC" standard macOS keyboard layout. 2) Entering Cyrillic letters using "Russian - BG46" custom macOS keyboard layout.
For both, I was entering the same 4 Cyrillic letters "фыва" (same keys as "asdf", but using Russian keyboard layout). Also, I've selected keyboard layout before switching to the app inside wine and copied the log before closing the app to avoid unnecessary keyboard events.