iOS/iPadOS Choosing tag closes new task

Can someone tell me what I am doing wrong here?

  1. Touch big “+” to create new task.
  2. Name task.
  3. Choose a tag and press “Done”, thinking it will dismiss tag window.
  4. Instead, entire task entry disappears.
  5. Press Inbox, which shows a new entry has been created.
  6. Inbox proves to be empty.
  7. Press Changed to finally find and finish editing the new task.

All I want is to create a task, assign a tag, and assign Defer, Due, Repeat, and Note in one step. Practically every time, the entry disappears after I enter a tag and dismiss the tag list.

Okay, I just selected a date for a new task on iPad, and the whole task disappeared.

???