note on nesting

Author: kdaswani

src/connections/destinations/catalog/actions-google-analytics-4/index.md

@@ -70,7 +70,7 @@ In addition to recommended events, you can also send custom events using the [Cu
 > In all cases, event names in GA4 are case sensitive. The Custom Event action includes a **Lowercase Event Name** option, to ensure consistency of all events sent to Google. For more information, see Google's articles [Google Analytics 4 event name rules](https://support.google.com/analytics/answer/10085872?hl=en&ref_topic=9756175#event-name-rules){:target='_blank'} and [Event name limitations](https://developers.google.com/analytics/devguides/collection/protocol/ga4/sending-events?client_type=firebase){:target="_blank"}
 
 #### Custom Dimensions & Metrics
-With Google Analytics 4, you must create custom dimensions and metrics within the Google Analytics 4 interface and link parameters to the corresponding dimension or metric. When creating the dimension or metric, you can either select a parameter from the list of already collected fields or enter the name of the parameter you plan to collect in the future. Custom dimensions can be either event-scoped or user-scoped; custom metrics must always be event-scoped. To send parameters to Google Analytics 4, use the Event Parameters or User Properties object available on every action.
+With Google Analytics 4, you must create custom dimensions and metrics within the Google Analytics 4 interface and link parameters to the corresponding dimension or metric. When creating the dimension or metric, you can either select a parameter from the list of already collected fields or enter the name of the parameter you plan to collect in the future. Custom dimensions can be either event-scoped or user-scoped, and custom metrics must always be event-scoped. To send parameters to Google Analytics 4, use the Event Parameters or User Properties object available on every action. Google will silently drop any events that include nested parameters so please ensure you are only passing flat key-value pairs in the Event Parameters and User Properties objects.
 
 To achieve parity with Universal Analytics, you will probably want to create the same custom dimensions that you defined in Universal Analytics. Additionally, many of the values that you tracked as event dimensions in Universal Analytics, particularly event category and event label, should be recreated in Google Analytics 4 as custom dimensions. For more information, see Google’s [Google Analytics 4 Custom dimensions and metrics](https://support.google.com/analytics/answer/10075209){:target='_blank'}.