Why are my Apt packages breaking following a change to the Heroku stack?

Issue

Some packages installed via the community supported Apt buildpack don't work following a stack upgrade

Resolution

As of 13th September 2019, there is a bug in the Apt buildpack which means that the build cache is not cleared when the stack has changed https://github.com/heroku/heroku-buildpack-apt/issues/48

This causes the packages from the previous stack to be used which can result in the wrong libraries are linked.

As a workaround you can clear the build cache manually with the following guide: How do I clear the build cache?

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