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The behavior you are observing may be attributed to how Google Analytics 4 (GA4) processes and attributes user data. Active users, considered as a metric, are deduplicated across the selected dimension. If you select “session default channel” as the dimension, GA4 deduplicates the user counts across the different channels. Consequently, when “date” is added as an additional dimension, Google Analytics 4 starts deduplicating active users for each channel across each distinct date. This may result in smaller user counts for some channels on specific dates due to this deduplication, which might make the user count appear inconsistent with your earlier query that didn’t include “date”. However, this is not a bug but an expected behavior based on the design of the GA4 data model. Perfect consistency in user count across different dimensions is not guaranteed due to this method of data processing and deduplication.
