Opportunity Score (IqScore) field returns null when referenced in a record-triggered flow or trigger

Einstein Opportunity Scoring populates a score on each scored Opportunity. This score is exposed through the Opportunity Score field, whose API name is IqScore (integer/number field).
The Opportunity Score field is a derived read-only field. Its value is not stored directly in the Opportunity table row; instead, it is calculated and returned only when the field is explicitly queried. Because the value is not part of the record's in-row data, it is not automatically loaded into the record in an automation's transaction context. As a result:

• In a record-triggered flow, referencing the field through the triggering record variable ({!$Record.IqScore}) returns null.
• In an Apex trigger, referencing the field through the trigger's new/old record context returns null.
• In a SOQL query (or a Flow Get Records element), the field returns its correct value, because the query explicitly retrieves the derived value from the database.

Affected feature / product: Einstein Opportunity Scoring (Opportunity Score field) on the Opportunity object.
Conditions that trigger the issue:

• Einstein Opportunity Scoring is enabled and the Opportunity has a valid score.
• Automation (a record-triggered flow or Apex trigger) reads the Opportunity Score field directly from the triggering record rather than querying it.

Prerequisites to observe correct behavior: The Opportunity must be scored (a score must exist), and the running user must have access to Opportunity Scoring.

Important: Reading IqScore directly from the triggering record has never been a reliable way to obtain the score, because the field is derived. Customers may observe that this behavior appeared to work previously and then stopped; regardless of prior behavior, the supported method is to query the field explicitly as described below.