I tried replacing <?php the_excerpt(); ?> with <?php if (isset($theme_options['theme_excerpts'])) newsletter_the_excerpt($post); ?>, as I’ve seen in other theme files, but this shows only the excerpt, and no “read more” tag.
This is for sure a theme filter which changed the_excerpt() function. We try to not use anymore the native wp functions because they too often are manipulated by themes, but we have not completed that migration on all our newsletter themes.
I am using a pretty old custom theme at this point. I made it from the default theme a couple years ago. Do I need to recreate it? Or can I copy something over from the current default theme to make it work correctly? Or how can I change the filter to make it work? Thanks.