Thanks for your reply, I think the quotation was just this forum format, I was using basic quotation in my server.
But I did try to make the change from double quote to single quote.
link in the View-source page:
<a href=“https://www.other-domain.com” target=“_blank” rel=‘noopenner nofollow’ >Test - test 2
that link under Chrome F12 Inspect:
<a href=“https://www.other-domain.com” target=“_blank” rel=“noopenner”>Test - test 2
Not only the nofollow was gone, the quotations were modified to double quotation!