Can not monitor network monitor

Hi. I use OC 0.6.4 with Catalina. Due to en0 problem I use null ethernet kext.

While I was not using that kext I was able to monitor my network speed with istat menus or some other similar software. But after upgrading my Mac OS and started using that kext I can not monitor my download speed. I can only see my upload speed.

Could it be relevant with the null ethernet kext or should I look for something else? If so is there anything I could try to solve my en0 problem besides using null ethernet?

Thank you.