While reading this i had a close look at it and found a bug that doesn't seem related
to what you are trying.
New values of the preferences should be picked (in portlet-instances.xml)
The bug was if you removed a portlet preference from portlet-instances, the data
wasn't actually removed.
I'm still curious to know why it fails for you, if you just added or updated a value
it should work (i tried again with the weather portlet)
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