OK, tried, wrote "cdc_mbim.conf" into /etc/modules-load.d with just one line cdc_mbim, restarted, no. I'm not sure it is worth time and effort to hunt this bug while there is an easy workaround. On the other hand we'll have more and more of those adapters, because more and more notebooks come without ethernet socket and people will buy usb2ethnert adapters. Should work on linux™. Close as wontfix?