I re-organized my stash-tabs and the old bug occured in the “online mode” too:
My sub-tabs are gone (i think while deleting another main tab, after moving some sub-tabs before).
if i add new main tab, the missing sub-tabs magically apear in the new main-tab.
If i click on an old “buggy” main-tab , multiple main-tabs got selected (and then i can not delete tab).