Ensure telemetry system works with `legacyNoObservedAttributes` setting

Polymer / polymer

Our original Web Component library.

https://polymer-library.polymer-project.org/

BSD 3-Clause "New" or "Revised" License

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Closed sorvell closed 4 years ago

sorvell commented 4 years ago

Addresses internal issue found with using telemetry system with the legacyNoObservedAttributes setting.