https://bugs.winehq.org/show_bug.cgi?id=40301
--- Comment #8 from VZ vz-wine@zeitlins.org --- I've tested with 1.9.8 (wine32-development from Debian Stretch) and can confirm that the problem is gone, thanks!
There are still problems with the appearance of the date picker control, but I'll report this separately, when I have time to debug them a little.