OK, we discussed a bit more:
So, we do not have an objecttype right 'move' as well as an objecttype attribute 'Allow moving', nor do we have a context folder right 'moving',
and to see the move something like a process with copy -> paste into new context -> delete old,
we judge the current behavior as bug, because we don´t check whether the user has the right to delete objects of this type.
So we will fix the bug in this way for the next release after 4.8.