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No packets captured on Macbook main wifi interface en0 while Monitor mode is On

Hi everyone,

I have a very strange problem with my Macbook running macOS High Sierra (10.13.6). I was always able to get wifi capture with it using wifi main interface en0. I was simply connecting to different SSIDs and was able to start capture with Monitor Mode On in Wireshark (2.6.6)

Since a week, I'm unable to see over the air packets even if en0 interface is detected and still can see traffic. I haven't done any update of MacOS nor Wireshark.

However, I verified if packets capture was still available on en0 interface using ''Airtool'' application and it is in fact capturing packets. It creates a file that is opened by Wireshark. As most of you might know, Airtool works by specifying channel and channel width. In Wireshark I was simply connecting to SSID to capture packets and was able to see the live capture.

So I know Packet capture works on my Macbook main wifi interface en0. But unfortunately, Wireshark doesn't let me see packets for some reason.

Any help would be very appreciated. Thanks in advance!