No CSIs from 0x88 QoS Data frames on Raspberry 3B+

[HeyGF]

Hi,

I'm running nexmon_csi on Raspberry Pi 3B+ following this instruction. It's great that it has Frame Control (FC) information with the CSIs. But I also noticed that it seems cannot capture CSIs from some frame types like 0x88 (QoS Data) frames. For example, below are the pcap files I captured using wireshark, when my phone was connected to an ASUS AC86U router and played youtube videos. I can see it has many 0x88 frames:

However, from the CSIs captured by nexmon_csi on Raspberry Pi 3B+ (I only set the router's MAC address as the filter), I only saw FC like 0x80 and 0x94, but no 0x88. nexmon_csi on ASUS RT-AC86U can get CSIs from FC like 0x88 (check the figure here). So I'm confused about what happens on Raspberry Pi3B+, and why no CSIs from 0x88 frame types.

Thanks for any comments!