Is there any other limitations with conman wireless client on RPI4?
I have problems detecting SSIDs 2 meters away to the router with a beacon interval higher than 100 ms for 5 GHz ac 20 MHz channel 36. It only connects with beacon interval 100 ms. Setting it higher it won't detect, all the rest settings equal, WMM-APSD disabled to rule out.
I like high beacon intervals like 1 sec to maximise throughput and never had a problem. Only Libreelec 13 with conman/iwd.