On my Portal Mini, a call remained connected where my video and audio were still transmitting, but on the other end, the call was disconnected. The other person's picture was displayed, but no audio or video. On the other person's end, the call simply dropped. When she attempted to call me back, she got the message "Nate is on another call."

I ran into a similar issue with Messenger, where a call was not connected on my phone, but the recipient was actually connected. The recipient could see and hear me, but I couldn't see or hear them and there was no indication I was in a call in Messenger. Despite the call still being active, I could use messenger normally, make additional calls (though whenever they connected, they immediately dropped), etc., but the active call bar wasn't present, the persistent notification wasn't present, and there was no audio or video from the other person. I think these issues are related and they both happened on the same day (yesterday).

Both instances raise privacy concerns for me, since it becomes difficult to trust that I'll know when my device is transmitting video or audio - while the physical switch is nice, I prefer to just trust the software.