192However, it follows from the Court’s case-law that, although such difficulties of interpretation and application may be such as to explain the conduct of an institution, body, office or agency where it turns out that it acted as an ordinarily careful and diligent administration would have done in similar circumstances (see, to that effect, judgment of 10 September 2019, HTTS v Council (C‑123/18 P, EU:C:2019:694, paragraph 43), they cannot, in contrast, qualify as excusable a manifest lack of diligence in the context of an examination such as that which the Commission was called upon to conduct with regard to IMG’s situation (see, to that effect, judgment of 4 April 2017, Ombudsman v Staelen, C‑337/15 P, EU:C:2017:256, paragraph 41 and the case-law cited), in particular when that lack of diligence consists in failure to address the questions that are at the heart of that examination or in drawing conclusions from it that are clearly inappropriate, deficient, unreasonable or unsubstantiated (see, to that effect and by analogy, judgment of 4 April 2017, Ombudsman v Staelen (C‑337/15 P, EU:C:2017:256, paragraphs 104 to 106, 109, 112, 114 and 117).
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