It's not so easy to explain it in full detail but please try to get the idea:
compare a pair of trees with the "sort both directories" option, e.g. by path, so as to have "holes" in the left panel due to "added" files.
mark a block of consecutive files with mixed status in the left panel list, including some holes, and copy it to the other directory.
the copy is done perfectly but the status of the last n files in the left panel, with n equal to the number of "holes", is wrong (e.g. they are still shown as "changed").
