[REQUIRED] Step 1: Describe your environment

• Xcode version: 11.6 beta
• Firebase SDK version: 6.27.0
• Firebase Component: InAppMessaging
• Component version: 0.21.0
• Installation method: CocoaPods

[REQUIRED] Step 2: Describe the problem

Steps to reproduce:

The docs for FIRInAppMessagingDisplay#displayMessage:displayDelegate: at https://firebase.google.com/docs/reference/ios/firebaseinappmessaging/api/reference/Protocols/FIRInAppMessagingDisplay.html#-displaymessage:displaydelegate: state:

Method for rendering a specified message on client side. It’s called from main thread.

But when overriding
FIRInAppMessagingDisplay#displayMessage:displayDelegate: on a custom message display component, the method will be invoked on a background thread.
Could you please update the behavior to match the documentation - or reverse?
Thanks! :)