Openjdk8 setup fails on focal

Installing openjdk8
$ export JAVA_HOME=~/openjdk8
$ export PATH="$JAVA_HOME/bin:$PATH"
$ ~/bin/install-jdk.sh --target "/home/travis/openjdk8" --workspace "/home/travis/.cache/install-jdk" --feature "8" --license "GPL" --cacerts
Ignoring license option: GPL -- using GPLv2+CE by default
install-jdk.sh 2020-06-02
Expected feature release number in range of 9 to 16, but got: 8
The command "~/bin/install-jdk.sh --target "/home/travis/openjdk8" --workspace "/home/travis/.cache/install-jdk" --feature "8" --license "GPL" --cacerts" failed and exited with 3 during .

https://travis-ci.org/github/kbase/workspace_deluxe/builds/721509502

Same problem here, although it’s supposed to be available according to the docs:

I’ve opened an issue on GitHub: