UPDATE: Edited a couple of posts and the links appeared for all of them. Question solved.
I’ve tried to add the previous/next post links in the editor on both “Single Posts” and “Single Posts (no separators)” without success. The links doesn’t appear.
The only thing I did different from what @kjellr suggested is that I’ve put the two components inside a line.
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This reply was modified 2 years, 7 months ago by Ivan Jer?nimo. Reason: Question solved