NC-client and file moving problem

Hello guys!
Situation description: I have folder “TEST_ROOT” in the root with this contents:

TEST_ROOT
 \--- TEST_INSIDE
file1.txt
file2.txt

Let I need to MOVE files “file1.txt” and “file2.txt” to the “TEST_INSIDE”.
If I doing that thru WEB-browser - everything was fine!
Both files moved into the “TEST_INSIDE” from “TEST_ROOT” folder.
But if I doing that moving thru my local disk folder and then NC-client syncing changes I get this:

TEST_ROOT
 \--- TEST_INSIDE
     \---file1.txt
     \---file2.txt
file1.txt
file2.txt

So this two files became duplicate.
It happens not every time, but often with NC-clients on MacOSX. Versions 2.5.2 and 2.6.0 of NC-clients are the same behavior.
I didn’t see that with Windows and Linux NC-clients.

Did somebody see the same situation? Is it possible to fix that?
Thank you!

Strange that this problem still exists but there is a workaround. After moving files on the client side, stop the nextcloud client and restart it. After that, it should also sync the moved files.