We created our server as discourse.redacted.com and then changed it to faq.redacted.local.
Some links show up as faq.redacted.local and the DO work.
Some links show up as discourse.redacted.com and the don’t work.
If I edit the posts (A) the links work 100% of the time in the preview, and (B) the links are relative links in the post (i.e. they don’t specify either discourse.redacted.com or discourse.redacted.com).