What is the issue with GA4 Configuration when it comes to missing user-provided data in PageView Events when using GTM on both the client and server-side?

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The issue with GA4 Configuration when using GTM on both the client and server-side is that user-provided data in PageView events may be missing. This is because when a user visits a website, a PageView event is sent to GA4, but the user-provided data may not be available on the client-side, because it may be generated on the server-side. This can result in incomplete or inaccurate data being collected by GA4, which can impact the accuracy of analytics and reporting. To address this issue, it may be necessary to modify the GTM setup to ensure that user-provided data is included in the PageView event, even when generated on the server-side.