latexmkrc settings are ignored

[thorstengrothe]

I found something similar here but the issue was closed so I open a new one, I hope this is ok

I got this settings in my latexmkrc file:

$pdf_mode = 1;
# Output directory
$aux_dir = 'Build'; # Works only in pdflatex
$out_dir = 'Build';
#$pdflatex = 'xelatex --shell-escape -interaction=nonstopmode -file-line-error -synctex=1 %O %S && cp --verbose %D %R.pdf'; 
$pdflatex = '&& cp %D %R.pdf'; --> This does not work.

When I compile the document the files go to Build, so this part works fine. But the second part

$pdflatex = '&& cp %D %R.pdf'

does not work. When I compile in a terminal and comment out the line
#$pdflatex = 'xelatex --shell-escape -interaction=nonstopmode -file-line-error -synctex=1 %O %S && cp --verbose %D %R.pdf'; all files go to Build and the pdf is copied to the source dir. But this does not work inside auctex.

What can I do?