On 5 April, the EU advised that a proposed EU Regulation is designed to help prevent duplications of proceedings and avoid cases of impunity where surrender under a European Arrest Warrant is refused. Furthermore, it should help ensure that criminal proceedings are conducted in the best-placed Member State, for example, in the State where the major part of the crime occurred.
https://commission.europa.eu/document/6b399192-3057-44a2-a6df-4510e164f67b_en
https://ec.europa.eu/commission/presscorner/detail/en/qanda_23_2108