It was fixed (http://bugs.winehq.org/show_bug.cgi?id=8771) so use the latest GIT.
Thank you, I will test it asap.
Should we maybe provide updates for previous wine versions in the case of serious regressions like this one?
I think that yes. This kind of bugs are very difficult to detect, so may be some people upgrade to a newer version because some graphical fix and they don't know that they are using a version with a dangerous bug that can corrupt data. Doing this it will be easy to test and find the optimal version to run a software.