Sorry I linked to the wrong package page for the security update in comment #30 yesterday (25 Jan).
For Ubuntu 20.04 (Focal Fossa) it should have been:
https://launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.12
I incorrectly linked to the Ubuntu 22.04 (Jammy Jellyfish) package, which I am not in a position to test for this problem.
Sorry I linked to the wrong package page for the security update in comment #30 yesterday (25 Jan).
For Ubuntu 20.04 (Focal Fossa) it should have been:
https:/ /launchpad. net/ubuntu/ +source/ bind9/1: 9.16.1- 0ubuntu2. 12
I incorrectly linked to the Ubuntu 22.04 (Jammy Jellyfish) package, which I am not in a position to test for this problem.