Issue
AFAICT, the cs-online-accounts.png icons in https://github.com/linuxmint/cinnamon-control-center/tree/master/panels/online-accounts/icons are not needed in cinnamon-control-center package as there is already a cs-online-accounts.svg icon in cinnamon package in keeping with all the other cs-* icons. The icons in this package are also in a different style to the others.
Having two different icons can also result in different icons being shown depending on the size in icon themes that do not override these icons.
btw, I'm assuming these icons are not used for anything else but I could be wrong. Also, if you're testing this, you'll need to update your hicolor icon cache.
Issue AFAICT, the cs-online-accounts.png icons in https://github.com/linuxmint/cinnamon-control-center/tree/master/panels/online-accounts/icons are not needed in cinnamon-control-center package as there is already a cs-online-accounts.svg icon in cinnamon package in keeping with all the other cs-* icons. The icons in this package are also in a different style to the others.
Having two different icons can also result in different icons being shown depending on the size in icon themes that do not override these icons.
btw, I'm assuming these icons are not used for anything else but I could be wrong. Also, if you're testing this, you'll need to update your hicolor icon cache.