18.06.6 HW Offloading not working?

Tested 18.06.6 with D-Link DIR-860L B1 with 1Gbps fiber connection, HW offloading seems not working, on and off resulted the same.

Is it a known bug? If it is, then which version has a working HW Offloading?

If not, what can I expect for working HW offloading with 1Gbps connection?