https://bugs.winehq.org/show_bug.cgi?id=49233
--- Comment #7 from Ker noa blue-t@web.de --- I wouldn't call it a regression. d3d11_device_CreateDeferredContext1 was a stub in 5.9-staging https://github.com/wine-staging/wine-staging/commit/0db92c336fcea4c383a15056... extended that function and now we probably moved on from being slow due to not being multi threaded to a buffer overflow because the implementation is not complete.
The underlying issue is still incomplete multi-threading so it is justified to keep the issue and change the symptoms accordingly.