mis-visualization of sharing rights for contacts

I'm using Carbonio CE 23.11 (not my installation, but an installation managed by a vendor).

I share "Contacts" folder with b@mydomain.com user (for example, with "Manage" rights). Then, if I go back viewing "Contacts" properties, I se there is one active share, but the window doesn't show me the address, so I don't know who I'm sharing it with.