@maschinenlesbar.org/abgeordnetenwatch-cli
    Preparing search index...

    Variable FORBIDDEN_FILTER_FIELDSConst

    FORBIDDEN_FILTER_FIELDS: readonly ["__proto__", "constructor", "prototype"] = ...

    Names that are never a field of any collection but have a meaning in JavaScript. __proto__ in particular was dropped silently: assigning it to a plain object sets the prototype instead of adding a key, so the filter never reached the query string and the unfiltered set came back with exit 0 (where the API rejects an unknown field).