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If using an Ignition release before v8.1.4 with MQTT Engine - In order for historical tag changes at the MQTT Engine tag to propagate to the referencing tag, MQTT Engine must be configured to write historical data directly to its tags and MQTT Transmission must be configured to flush history in-order. See this section above for more details on these configuration requirements.

If using an Ignition v8.1.4 or later with MQTT Engine - Historical back-fill support was added in Ignition which allows Reference Tags in Ignition to be updated even if history arrives out of order. See the following document for details: MQTT History Back-Fill with Reference Tags

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