I am also encountering this issue, specifically as follows:
Query:
SELECT conversion_action.name, conversion_action.firebase_settings.event_name, conversion_action.category FROM conversion_action The returned list contains all conversion actions belonging to categories such as Default, Download, Purchase, AddToCart, BeginCheckOut, PageView, Contact.
BUT, the conversion actions that I see in the Google Ads UI, which belong to the In-app ad revenue category (for example, conversion actions like ad_impression, which are sent from AdMob to Firebase and then imported into Google Ads), do not appear?
I am wondering whether these ad_impression conversion actions belong to the conversion_action table?