Rules on data transfers of the ZVOP-1 ceased to apply due to the precedence of the GDPR.
According to the Slovenian Ministry of Justice and the Information Commissioner, the adequacy decisions issued by the Information Commissioner before May 25, 2018 remain in force until amended, replaced or repealed (the list of the decisions is available here).
Full adequacy decisions were issued with regard to Switzerland and North Macedonia, whereas Israel was given partial adequacy status. While Switzerland and Israel have also obtained adequacy status by the European Commission, North Macedonia has not. Nonetheless, Slovenia still considers North Macedonia as providing adequate protection, meaning that the transfers of personal data from Slovenia to the Republic of North Macedonia do not underlie any restrictions.
The Information Commissioner issued guidelines on transfers of data to third countries under the GDPR, which are available here (in Slovenian).