I get a window warning me that I don't have enough free space but what indicates most that this is now a Copy operation is the XYcopy window that says "Custom Copy" instead of "Custom Move", even so I tried just OKying everything to see what happens and yes, XYplorer starts to copy the files to the new location.
It has happened two times, the first time it happened I tried one more time and in this second try it did moved all the files (these were 15K files) without problem, in this second time I've tried several times but I keep getting the XYcopy window.
With 5000 files I had no problem.
This must be new because I moved all those thousand files not long ago (it must have been with version 20.30.0002 or something close but earlier) just fine, with 22.40.0238 and (I now tried) 22.50.0100 I'm getting this "bug".
Something to note here is that when I move all these amount of files XYcopy doesn't do the move operation, I get a Windows' progress window that does the moving.
EDIT: Tried selecting 10000 files and still getting the