Since a week, when I undo in object mode, sculpt mode or in the properties panels (in fact in all editors I tested except edit mode), it doesn't undo in the mode, but instead it enter the edit mode of the last object I edited and undo there.
Also it destroy the work I've done since the last time I was in edit mode. So my blender is totaly unusable. I'm downloading every daily build since a week in the hope it corrects but it doesn't. I also found that my previous 2.8 builds doesn't work anymore and that my 2.79 bender just works fine. So I gess it might have something to do with the user preferences. I have no idea.
I didn't found anyone with a similar problem, and no bug report reffers to it.
It isn't a keyboard problem since I tested to undo by the menues, and
ctrl+z just works fine in edit mode. It repeats with every new files I create and in older too.
The one who solve my problem is awesome, and thanks to anyone that gives a gess