Projects: when you clone a project, the task and milestone dates now move with the new start date by default. Change the start date and the whole plan follows it.
Fix
Projects: cloning a project without copying the task dates now really leaves the dates empty. Shifted dates that were before the project start now stay before the new start, and deadlines keep their time.
Projects: cloning a project that has no start date now moves its dates from its earliest task or milestone date.
Projects: a project created by a client is now always linked to that client.
Tasks: a task's "blocked by" and "blocking" lists no longer show unrelated tasks whose number happens to contain the same digits (for example task 12 showing up for task 1).
AI assistants and Marvin: task and project titles, descriptions, comments and checklist items they write are now cleaned of unsafe HTML, the same way as when you type them yourself.