Blog Posts cannot be moved [23 December 2021]

It should be possible to move blog posts from one collection to another but this is no longer possible on Squarespace 7.1. This is due to a new bug that was introduced the UI was changed and checkboxes were added next to each post. When trying to select one blog post with shift held, other blog posts are also selected.

This has been confirmed as "a technical issue that prevents the Move option from appearing unless more than one post is selected".