In case you are facing one of the following difficulties on Google Analytics 4 (GA4):
Data discrepancies when comparing your SyncWith report to GA4's dashboard
A field is missing
A field is incompatible with your previously selected fields
You can test and troubleshoot it independetly using Google's own Query Explorer tool. The data in Query Explorer should match the data displayed by SyncWith and the tool can help you assess whether a field will be retrievable or compatible as intended.