When uploading a pdf file, I get Warning: Unimplemented widget field type "null", falling back to base field type at pdf.worker.js. The file is not loading.
I'm using the chrome browser. All other files are processed fine, but this one is not. Help solve the problem.
[usn2020.pdf](https://github.com/mozilla/pdf.js/files/5936611/usn2020.pdf)

filledDict.set("bar", "baz");
      expect(getInheritableProperty({ dict: filledDict, key: "foo" })).toEqual(
        undefined
      );
    });
    it("fetches the property if it is not inherited", function () {
      const ref = Ref.get(10, 0);
      const xref = new XRefMock([{ ref, data: "quux" }]);
      const dict = new Dict(xref);
      
      dict.set("foo", "bar");
      expect(getInheritableProperty({ dict, key: "foo" })).toEqual("bar");
      
      dict.set("baz", ["qux", ref]);
      expect(
        getInheritableProperty({ dict, key: "baz", getArray: true })
      ).toEqual(["qux", "quux"]);
    });
    it("fetches the property if it is inherited and present on one level", function () {
      const ref = Ref.get(10, 0);
      const xref = new XRefMock([{ ref, data: "quux" }]);
      const firstDict = new Dict(xref);
      const secondDict = new Dict(xref);
      firstDict.set("Parent", secondDict);
      
      secondDict.set("foo", "bar");
      expect(getInheritableProperty({ dict: firstDict, key: "foo" })).toEqual(
        "bar"
      );