The underlying problem seems to be that release_type is '' in promote decision task - https://taskcluster-artifacts.net/f7FzjhA9TlCwrtaXCPgNqw/0/public/parameters.yml. The bz2 toplevel task would be included if it was 'esr60'. Something may have been missed when https://hg.mozilla.org/releases/comm-esr60/rev/440a81faa54e landed.
Bug 1524445 Comment 4 Edit History
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The underlying problem seems to be that release_type is '' in promote decision task - https://taskcluster-artifacts.net/f7FzjhA9TlCwrtaXCPgNqw/0/public/parameters.yml. The bz2 toplevel task is expecting to get ['esr60'](https://hg.mozilla.org/releases/comm-esr60/file/default/taskcluster/ci/release-balrog-submit-toplevel/kind.yml), while PER_PROJECT_PARAMETERS wants to set ['release'](https://searchfox.org/mozilla-central/source/taskcluster/taskgraph/decision.py#93). Something may have been missed when https://hg.mozilla.org/releases/comm-esr60/rev/440a81faa54e landed.