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The problem you are experiencing could be due to a number of factors and it’s difficult to identify the exact issue without further analysis. It’s possible that the events are getting filtered out during the rollup process due to some filtering settings, or there might be a delay in processing the event data. If the amount of data being sent is large, some events may be dropped due to throttling. You should also verify if there’s a discrepancy between your raw data set and BigQuery’s exported data. It’s also worth noting that GA4 filters out bots and spiders, so some traffic may not get recorded. Another possibility is that GA4 discards sessions with events that have out-of-bounds timestamps. It’s suggested to seek support from Google Cloud Support for a more in-depth analysis of your situation.
