How to open a iOS unity App by url when using Vuforia

Hello,
I have registered an URI scheme to open my iOS App (in info.plist). It works fine.
I have written an iOS Plugin to send the URI with parameters to my Unity Component.

// See the full script here:
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@interface MyAppController : UnityAppController
{
// openURL() => UnitySendMessage()
}

It works fine.

If I install Vuforia (vuforia-unity-6-2-10.unitypackage) MyAppController is ignored. openURL() is never called.
My App starts but I need the start URI.

Is that a problem that I have two instances of UnityAppController - the one of Vuforia and mine?
Is there a Bug? Is there a workaround?

Thank you.

Did you ever find a solution to this issue?