https://bugs.winehq.org/show_bug.cgi?id=57240
--- Comment #15 from Miliardo agarplayerarlon@gmail.com --- (In reply to Charlotte Pabst from comment #14)
I submitted a fix to the regression as https://gitlab.winehq.org/wine/wine/-/merge_requests/6589
Until this is merged, you can use the following workaround: If you select a different file type in the menu, and then select .wav again, it will let you save the file as WAV properly.
Sorry for the trouble.
Thank you for submitting the fix