Hi team!
I tried to set the publisher user group for a content in permissions panel. However, this user group was removed, because the permissions of the user group were equal to the default ones. After saving, the content permissions didn't have these user group permissions, so users belonging to this user group couldn't publish this content. I had a look at the content controller; this is the statement, leading to this logic.

if (userGroup.Permissions.UnsortedSequenceEqual(groupPermissionCodes))
                {
                    //only remove them if they are actually currently assigned
                    if (contentPermissions.ContainsKey(userGroup.Id))
                    {
                        //remove these permissions from this node for this group since the ones being assigned are the same as the defaults
                        Services.UserService.RemoveUserGroupPermissions(userGroup.Id, content.Id);
                    }
                }

Permissions panel:

Default permissions: Could anyone please help me explain and solve this problem? :(