I have a task which is in progress in my current sprint- it correctly appears in my task board as 'in progress'
I realised there was another piece of work to complete as part of my task, so I opened the task and created a child task, set it to my current sprint and saved it.
My new task has appeared in the 'to do' section of the task board, however my original task has disappeared completely from the task board.
If I open up the new task which correctly appeared in my todo list, and open the linked work item, i can see that it is correctly set to the current sprint, that it in progress, and that hte only thing that has changed is that there is now a linked child task item.
Additionally, if i remove the link between the two workitems, both work items appear in the task board as expected
I believe that this is a bug, where tasks with sub tasks cannot be displayed on the task board