When a task has a large number of sub tasks, a newly added task is not visible unless you click ‘Load more sub tasks’. This is very confusing for new Asana users but I have learnt that you have to expand all tasks and then click add task.
I organize my sub tasks and encourage my team to do as well, where the recently added sub tasks at the beginning of the sub task list. The above existing behavior forces me to drag and drop the newly added sub tasks from the bottom to all the way from the top. Instead it would be super useful to have a ‘+ Add sub task’ action at the top, which adds the newly created sub task to the top of the list.