It appears the ppa is no longer "just working" because the mainline bionic Ubuntu version of python3-pip has incremented. That is to say, even after adding the ppa and doing apt update, apt-get install pulls the buggy one from the mainline repo.
I was able to get the right version by using:
apt install python3-pip=9.0.1-2.3~ubuntu1.18.04.2~ubuntu18.04.1~ppa202002141134 python-pip-whl=9.0.1-2.3~ubuntu1.18.04.2~ubuntu18.04.1~ppa202002141134
It appears the ppa is no longer "just working" because the mainline bionic Ubuntu version of python3-pip has incremented. That is to say, even after adding the ppa and doing apt update, apt-get install pulls the buggy one from the mainline repo.
I was able to get the right version by using: pip=9.0. 1-2.3~ubuntu1. 18.04.2~ ubuntu18. 04.1~ppa2020021 41134 python- pip-whl= 9.0.1-2. 3~ubuntu1. 18.04.2~ ubuntu18. 04.1~ppa2020021 41134
apt install python3-