I added a child to an issue and it appears. I don't see a way to delete it.
Clicking "Bulk Edit" gives me the option to delete issues, which isn't the same thing as removing it as a child.
How do I delete a child?
It seems that children are subtasks (see How do I assign an existing issue as a child issue in Next Gen?) so removing a child issue isn't possible unless it also is converted into a normal task, hence why there is no "Remove Child Issue" button.
Going to the child issue and selecting "Change parent" doesn't offer "No parent," it offers just other possible parents.
The way to remove a child is to select "Move" on the child and change it back from a Subtask to a Task.
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