Tasks disappear

• for every issue, I create a task with a changelog and a branch to use
• Task history length is set to 50
• Save context on commit is checked
• despite the history length, I only see 7 tasks in the dropdown
• recently even the default task disappeared
• I miss a lot of recently used tasks, they are not in the Recently Closed Tasks (how do I close a task anyway?)
• (Recently Closed Tasks are not tasks created by me, but commits)
• the changelogs belonging to the disappeared tasks are still there

Why do tasks disappear?