Advanced Search doesn't find ID

I have an internal identifier stored in a dcterms:identifier field. When I look up that specific field in a search (in one of the filters) the system doesn’t find my item, neither with ‘is exactly’ or ‘contain’. If I search for that ID in the main search (e.g. 24296) then I find that item. Is there something special about filtering through dcterms:identifier?

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