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#11
I have noticed the same thing with the COPY. If the target file or folder already exists, you expect to get prompted what to do (Copy and Replace, Skip, or Copy and Keep), and sometimes I do, but some of the time it chooses a default of "copy and keep" for me w/o asking, end up with the original, and then a copy with the same name, appended with (COPY) or (2) appended.
I have noticed other odd behavior with Explorer (which I may discuss in another thread), so that may have something to do with it, too.
I'll spend a little time seeing if I can reproduce easily, and then "Send Feedback" on it.
NOTE: I believe the problem occurs when I left-click and drag, for default "copy" action, as opposed to right-click, drag, select "Copy".