Error when enabling dimensional metrics

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NRI agent version: $ newrelic-infra -version New Relic Infrastructure Agent version: 1.13.2, GoVersion: go1.14.4, GitCommit: 3226d2c69efbf91d56c301d1c3b65fea3c388093

With config value dim: false data is gathered by the plugin and can be viewed in New Relic as standard events in CollectdSample events as expected. When plugin is configured with dim:true and a New Relic Insert key configured, no data is seen and the verbose NRI logs just have spam of

time="2020-12-14T22:11:20Z" level=warning msg="cannot handle integration output" error="invalid character '/' after top-level value" instance=hostname integration=com.newrelic.collectd-plugin prefix=integration/com.newrelic.collectd-plugin working-dir=/var/db/newrelic-infra/custom-integrations