Recent changes seem to have fixed the problems. I've just realised that Astro doesn't have a schema for sites sourced from WP. Obvious, really

This caused trouble in the Astro sites which source content from WordPress sites like this. The 'Select posts' page is a block page containing selectors for By date — WP Archives block. Works in Astro. By category — WP Categories list. Doesn't work in Astro. By author — ncvp_author_list shortcode because WP doesn't provide a […]