I think they do. I've also had huge problems with Zoom when talking to my parents, because for some reason they are aggressively muted for several seconds while nobody else on the call is canceled like that. If anyone else on the call so much as clears his throat, my parents are muted and we all have to sit silently waiting for them to be able to talk. Annoying as shit.

I suspect that this is noise cancellation that's failing because they keep their phone far away from themselves, to fit two people in the shot; and audio is bouncing off the walls or otherwise suffering enough delay to mess it up.

Yes but I was looking for a way to run a process that does that on your desktop because I'd like to do ANC using two dynamic mics.