I think its a separate issue from the core update. I did have that issue with internal calls on core v13.0.120.0 and I have tried on the latest module update (13.0.120.3). This seems to be related to when I restart asterisk and it completes its upgrade from 13.14.0 to 13.15.0.
Here is my issue that I submitted - Asterisk Reboot Breaks External Audio