Clarification on In-App Messaging Display Timing

[ryoooooory]

Hi,

I'm using Firebase in an iOS app via Swift Package Manager (SPM).
I have a few questions regarding the display timing of Firebase In-App Messaging, specifically when using auto-collected events like screen_view and session_start as triggers.

1, When registering messages with auto-collected events such as "screen_view" or "session_start" as triggers, the in-app messages are not displayed at the moment those events are fired.(I have confirmed that events like screen_view are being correctly triggered in Analytics (DebugView))
Why does this happen?
(It appears that no processing occurs on the In-App Messaging side when these events are triggered — e.g., FIRIAMDisplayCheckOnAnalyticEventsFlow.messageTriggered doesn't seem to be called.)

When tracing the internal processing within the Firebase SDK,
For "app_launch" and "on_foreground", messages are not triggered through event logging and listener callbacks via Analytics, but rather through internal lifecycle detection within In-App Messaging itself (as defined in FIRIAMRenderTrigger).
Therefore, when a message is configured with on_foreground as the trigger, it is automatically displayed at that timing in the app as well.

2, When I manually call logEvent("screen_view"), the In-App Messaging logic is triggered (via checkAndDisplayNextContextualMessageForAnalyticsEvent), but the event name is received as "_vs".
Why is this the case?
Because of this, even if a message is registered with "screen_view" as the trigger, calling logEvent("screen_view") in the app will not display the message.