https://bugs.winehq.org/show_bug.cgi?id=45349
--- Comment #30 from i.Dark_Templar idarktemplar@mail.ru --- (In reply to Justin King-Lacroix from comment #29)
HOORAY! IT WORKED!
Built from wine-5.13 tag, with staging patches tagged v5.13. And also against vkd3d at HEAD. Now it works. (Although Battle.net.exe now locks up on exit. That's... somewhat unfortunate.)
Try adding 2 patches from bug #49590 too, this fixes Battle.net app issues for me.