I can't reproduce the problem here; no matter what I try.
Maybe you have some special setup: for instance a remote drive (not a local disk), the file/directory does not have write permissions etc.
A useful test would be to download a fresh copy of hashcat from https://hashcat.net/hashcat and create fresh copies of the files (hash file, dictionary file etc) without cp'ing them and test it again.
Maybe you can also test with a different computer (again without copying everything, prefer fresh copies of the files) such that we can exclude that the problem lies on that particular setup.
Maybe you have some special setup: for instance a remote drive (not a local disk), the file/directory does not have write permissions etc.
A useful test would be to download a fresh copy of hashcat from https://hashcat.net/hashcat and create fresh copies of the files (hash file, dictionary file etc) without cp'ing them and test it again.
Maybe you can also test with a different computer (again without copying everything, prefer fresh copies of the files) such that we can exclude that the problem lies on that particular setup.