Samsung themes treat all same named apps as Samsung apps when applying Samsung themes. Since S6 this bug is present. Google Calendar and Google Contacts and so on get recognized as a Samsung app and the icon pack is applied on them.
Please fix it. 
Samsung themes treat all same named apps as Samsung apps when applying Samsung themes. Since S6 this bug is present. Google Calendar and Google Contacts and so on get recognized as a Samsung app and the icon pack is applied on them.
Please fix it.