That is kinda worrying, though I don't use that functionality myself. Is there another way that passwords could be passed between apps without using the clipboard?
(https://play.google.com/store/apps/details?id=keepass2androi...)
Adds one more step for setting things up but saves the clipboard as a whole. People using password managers are already people willing to jump through some hoops to set things up, adding one more hoop shouldn't make things worse.