Why does import xcframework in App target allows another dynamic framework to use that xcframework?

The structure looks like this

  • App target adds FBSDK xcframework
  • App target adds another in-house custom dynamic framework target


My question is:

After adding FBSDK xcframework in the app target, I can also use FBSDK classes in my dynamic framework target (which I didn't add the FBSDK framework to.)

As you can see, I only add FBSDKCorekit.xcframework to the app target

But in MyFramework's class, I can use FBSDKCoreKit without adding it as a dependency to MyFramework.framework

Does anyone know why? Based on my understanding, if you didn't add specific framework to specific target, you can't use it.