Here's a link to download a wireshark which is able to parse 11AX IEs and packets.
I tried v2.9.x and it was able to see 11AX IEs and HE frames.
For Mac OS
https://www.wireshark.org/download/osx/
For Win32
https://www.wireshark.org/download/win32/
For Win64
https://www.wireshark.org/download/win64/
