View source for Progress bars not updated, when copying and "replace all older" is pressed.

My task, I update some directory by overwriting older files.
On left panel I select source directory, on right I see target.
Next I press F5 . At start TC counts source, then begin copying.
When it try overwrite first file, ask me question. I select "overwrite all older files".
All is done OK, current files are written, but progress bars are updated only when something is really copied.
If two directores are the same contents, From beginning to the end I see 0%. It is problem for me,
because I'm updateing very big directories. It take long time, and I don't know how much is done.