QXP 6.5: Changes to master page text don't "take"

Hello,
I run this (in QXP 6.5, 10.4.11):

tell application "QuarkXPress"
	tell project 1
		tell master layout space 1
			tell every story
				set every text where it is "June 30, 2008" to "June 30, 2009"
			end tell
		end tell
	end tell
end tell

but the changes aren’t happening on the “real” pages in the document.

And I did doublecheck that the master items were still linked.

Anyone know why?
A limit in Quark’s Applescriptability?