Iterating through and moving child tasks

Automation OmniFocus Automation
#1

Why does this work:

tell application "OmniFocus"
	tell default document
		set anItem to task id "ppkNM6eAXnn"

		set newProject to make new project
		set name of newProject to name of anItem

		repeat with aChildTask in anItem's tasks
			move (task id (id of aChildTask)) to end of tasks of newProject
		end repeat
	end tell
end tell

Whereas this doesn’t:

tell application "OmniFocus"
	tell default document
		set anItem to task id "ppkNM6eAXnn"
		
		set newProject to make new project
		set name of newProject to name of anItem
		
		repeat with aChildTask in anItem's tasks
			move aChildTask to end of tasks of newProject
		end repeat
	end tell
end tell

(The only difference is in the “move” line)

#2

Actually, this works:

	repeat with aChildTask in (get anItem's tasks)
		move aChildTask to end of tasks of newProject
	end repeat