'Topic column in BigQuery partitioned table is empty (only) when sending data messages to more than one topic

I'm using BigQuery Data Transfer from Firebase. The data is saved in a partitioned table by day. topic column is nullable string. I'm viewing the data on the project's gcp console (https://console.cloud.google.com/bigquery).

Does anyone know why topic column is empty (only) when I send data message to more than one topic??



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