Unable to download artifacts: missing runtime context

Problem

After the release of Bamboo 5.4-OD-5 today, Bamboo is no longer able to download artifacts when running builds, and fails with the below error:

Starting task 'Fetch ear' of type 'com.atlassian.bamboo.plugins.bamboo-artifact-downloader-plugin:artifactdownloadertask'
Unable to download artifacts: missing runtime context
Finished task 'Fetch ear'

Workaround

Unfortunately, no workaround yet. Once we have more details, we will be communicating it here.