The code
$SNF_fh->close
closes the filehandle $SNF_fh.
But further up, the call to tempfile returns a filehandle that you store in the variable $fh. You never show where $fh is closed.
If you are not interested in the filehandle and only in the name of the tempfile, immediately closing the filehandle returning from it is the sanest approach:
my ($fh, $filename) = tempfile( DIR => $self->{Temp_Dir} );
close $fh; # we only want the filename
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