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As of now, it does seem like the new Data API for GA4 is causing some discrepancies when fetching “Landing pages” bundled with “Sessions”, with a percentage of sessions appearing in the (other) category. This is possibly due to high-cardinality reports, even though the same data seems unsampled in the UI Explorations custom report. Currently, we’re unsure why the API doesn’t allow access to unsampled data, which makes this situation different from the previous Core Reporting API, where there were controls to manage sampling and provided a complete data report. At this moment, there’s no clear information about when these issues with the Data API, which is still in its trial phase, will be addressed or improved.
