Detail Page (Standard) view client script: field event callback (onBeforeUpdate) not received

In a Detail Page (Standard) view, I want to update some other field values when a particular field (e.g. field1) is changed, but my client script doesn't seem to get called when I test it in the client script IDE and on an actual record. I don't see the log trace message I have implemented in the code and the expected behaviour change doesn't happen.

Is onBeforeUpdate ever sent by the Javascript framework?
Is the documentation in this page correct: https://www.zoho.com/crm/developer/docs/client-script/client-script-events.html#detail-page-event?

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