sta-wifi-mac.cc cond="!link.bssid.has_value()", High occurance at higher numbers of STAs per AP in indoor deployment.

Hello,

First, I want to thank you for the offered modules and the excellent support.

I have been getting this Assert from sta-wifi-mac.cc when I try to deploy higher numbers of STAs(5) per AP(1) indoors for both 80211.ax or 80211.ac standards. (I have attached .png with backtraces from gdb)

I have re-created the error in the latest ns-3 master branch using a deployment of 6 APs and 30 STAs total. You can use the wifi-debug.txt in order to clone into the repository and run the example I created in the scratch folder.

Thank you very much! Also, any feedback on making the new issue better will be good.