You know this part but just to be complete: what I tell you three times is true.
Whenever you do you are guaranteed to lose your changes.
I found that replacing “<” and “>” with “(” and “)” respectively fixed it. But naturally, when I updated WordPress, it returned to its former state.
There may be a filter somewhere but the problem is your mail client. Using <link> is accepted by standards based mail clients. I’ll look some more to see if there’s a way to edit that content without hacking a core WordPress file.
Thanks for your time. Appreciate it.
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