Your expression looks fine to me, can you please share the property/control name where are using this expression?
If you are looking for something that auto-collects the collection, then this expression can either be put on "OnStart" property of you App or "OnVisible" property of your page.
This could be a caching issue as well, can you try to logout of the current browser, close it and clear the cache, try to relogin and confirm if this collecting the data again?
Hope this Helps!
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