The initiators challenged the EC’s decision at the Court of Justice of the European Union. They found the Commission’s reasoning controversial, arguing that even though the Commission rejected the initiative, it also wrote that some of the acts requested in the Annex to the Minority SafePack Initiative might be acceptable.
Source here:
(https://www.europarl.europa.eu/cmsdata/75973/MSPI_Basic_information_de_Boer_en.pdf )