Edit: Sorry, did not realize you pushed it to a new release. Will be on a lookout for the new update. Thank you and disregard the message below.

I appreciate your quick response and your prompt action. Unfortunately, it has not resolved. Whilst my initial call is on, I get a missed call notification (attempted callback, I assume) and only then is the initial call disconnected. I would assume it happens because the initial call was still in progress and the callback hits the busy signal or something like that.