
A task that landed on the wrong board no longer needs to be recreated. Open it, choose Move To Board from the three dots menu, pick the destination board and project, and move it - with everything attached.
Moving a project to another board got the same upgrade under the hood: time entries, reminders, reactions, and change history now follow the tasks, and the search index moves with them.
Read the Move Task To Board docs for the full list of what moves, what changes, and what is removed.