SharePoint library Sharing in modern and classic view

Hello everyone,

I was checking over internet for my problem solution, but without success. I have a problem with sharing in SharePoint online library.

When we display our Sharepoint library in modern view we can’t share the content to any existing AD security group. There’s message “no result” when we try to share.

This is internal security group. No external sharing.

But when we switch back to classic SharePoint it works without any problem and I can share to this group.

What’s wrong? Can I change it somehow?

Thank you in advance

Tomasz