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Google Analytics 4 (GA4) employs a feature called ‘Identity Spaces’ to map the user journey across different events. This means that even if the user starts with a pseudo ID and later switches to a permanent user ID, GA4 can link these IDs together and understand they belong to the same user. Hence, it won’t treat them as different users once a permanent user_id is set. However, to ensure accurate tracking, it’s important to include both the user_pseudo_id and the user_id in all subsequent GA4 events once the user_id has been assigned.
As for the ‘lost’ events in the funnel, there are a few possible causes. Firstly, it could be due to the redirection between different subdomains. GA4 sees different subdomains as separate entities and might not track the user journey across them unless you specifically setup cross-domain tracking. Another possibility is tracking prevention mechanisms like ad-blockers, which some users may have installed. These can prevent certain events from being tracked. Lastly, it could be due to the users not following the exact sequence of events in the funnel. For example, if a user skips one event in the funnel, they won’t be included in the final funnel visualization. As such, it’s important to validate your tracking setup and understand your users’ behavior on your site to fix any potential issues.
