Why does this filter returning an error in UI

Summary:

I created a custom cx-picker with a query that looks like this:

<oj-vb-fragment-param name="query"      value='[[ [{"type": "savedSearch", "params": [{"key": "queryUuid", "value": "f66e2629-7494-4a4d-b16b-d41fd9391c5a" }]}] ]]'>

</oj-vb-fragment-param>

The field is displaying correctly but it is returning an error when trying to search

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