Hm this is a strange error. The DraftGui.dummy indicate this happens in Draft's "toolbar" mode, but I cannot reproduce it here, and don't see what can be wrong..
Can you try setting the Draft module in "taskview" mode and see if the problem still occurs?
1) go to menu Edit -> Preferences -> Draft
2) set "Draft Interface Mode" to "Taskview"
3) restart freecad and try to create a sphere and move it