For the EPO's failure to deliver the opponent's statement of grounds of appeal to the patentee (respondent) see chapter V.B.4.3.19 "Successful petitions under Article 112a(2)(c) EPC".
Source: http://www.epo.org/law-practice/legal-texts/html/caselaw/2019/e/clr_iii_b_2_3_8.htm
Date retrieved: 17 May 2021