Created attachment 15587 [details]
Network trace

Hello,

I've stumbled upon another bug most likely related to #14137. It seems that a simple python script like the one below makes samba not to clear the hidden dos attribute of a previously created dot file.

This only happens when the file that is going to overwrite another file has the permission 444 (r--r--r--).

How to reproduce:
1. Mount a Samba 4.11 share using the mount command: mount
//server1/share /tmp/share1
2. Run python script:
	#!/usr/bin/python

	import shutil
	import tempfile
	import os

	tmp_dest_fd, tmp_dest_name = tempfile.mkstemp(prefix=b'.file_tmp',
	dir='/tmp/share', suffix='test.pdf')

	shutil.copy2('testfile', tmp_dest_name)
	os.rename(tmp_dest_name, "/tmp/share/testfile")

Expected results:
Temporary file created by mkstemp should be renamed to testfile and no longer have the hidden dos attribute.

The mount command is: mount //localhost/share /tmp/share -o username=Administrator