gitchannel

``` with open('test_issue_known_mcs_zero.pcap', 'wb+') as fp: pcap_content=b'\xd4\xc3\xb2\xa1\x02\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\x00\x00\x7f\x00\x00\x00\xef"\xaaf\xf2k\x05\x00.\x00\x00\x00.\x00\x00\x00\x00\x00\x12\x00*\x00\x08\x00\x10\x00x\x14@\x01\xa0\x00\x00\x00\xe0\x00\x00\x00\xa1\xa1\xa1\xa1\xa1\xa1\xb2\xb2\xb2\xb2\xb2\xb2\xc3\xc3\xc3\xc3\xc3\xc3\xe06\x00\x00\x00\x00\xfa#\xaafM\xe2\x0b\x009\x00\x00\x009\x00\x00\x00\x00\x00\x1d\x00+H\x08\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10\x00\x9e\t\x80\x04\xbf\x00\x00\x00\x07\x00\x03\x88A,\x00\xa1\xa1\xa1\xa1\xa1\xa1\xb2\xb2\xb2\xb2\xb2\xb2\xc3\xc3\xc3\xc3\xc3\xc3PM\x9f0h\x1a' fp.write(pcap_content) ``` In this pcap are 2 packets to demonstrate one issue. the first packet is parsed wrong and the second seems ok....

[Radiotap MCS field definition](https://www.radiotap.org/fields/MCS.html) The ReversePadField is wrong, because the subsequent parts of the field are all ConditionalField to pkt.present.MCS. The PR #3963 fixed this issue. I don't know what...