I have run tests on Xenial, Bionic and Focal, exactly the same as on comment #2, this time with the packages from the ubuntu-security-proposed PPA show on comment #9 and I can confirm that this fixes the issues as well.
I have run tests on Xenial, Bionic and Focal, exactly the same as on comment #2, this time with the packages from the ubuntu- security- proposed PPA show on comment #9 and I can confirm that this fixes the issues as well.