Publish failes with usage of `as` keyword

Please include the following with each issue:

1. Describe the bug

https://www.youtube.com/watch?v=-7jh-9h-3Nc&t=2462s

If you are targeting a cloud instance, supply these IDs if contacting Microsoft support.
[2024-07-18 13:17:51.38] The request for path /f0e918da2707dev/dev/apps?tenant=default&SchemaUpdateMode=synchronize&DependencyPublishingOption=default failed with code UnprocessableEntity. Reason: Publishing failed due to 'C# compilation has failed for the application object CodeUnit_50102.
The failing c# file name is 3CDE62AA3D2B7A3932BBF38A1368C3CD453FD7F0D597211EE31134ED86AB0AD6.cs. You can find this file with the associated AL file saved in the c:\DatabasesVol\ALAssemblies\apps\compilationerrors folder.
Detailed compilation error: c:\DatabasesVol\ALAssemblies\apps\metadata\3\3C\3CDE62AA3D2B7A3932BBF38A1368C3CD453FD7F0D597211EE31134ED86AB0AD6.cs(78,70): error CS1061: 'NavInterfaceHandle' does not contain a definition for 'InvokeInterfaceMethodAsync' and no accessible extension method 'InvokeInterfaceMethodAsync' accepting a first argument of type 'NavInterfaceHandle' could be found (are you missing a using directive or an assembly reference?)
'. The original extensions have been restored.

2. To Reproduce Steps to reproduce the behavior:

// Welcome to your new AL extension.
// Remember that object names and IDs should be unique across all extensions.
// AL snippets start with t*, like tpageext - give them a try and happy coding!

namespace DefaultPublisher.v25FeatureTest;

using Microsoft.Sales.Customer;

pageextension 50100 CustomerListExt extends "Customer List"
{
    trigger OnOpenPage()
    var
        Capacity: Codeunit "Capacity";
        ICapacity: Interface CapacityInterface;
    begin
        ICapacity := Capacity;

        DriveCar(ICapacity as CarInterface);
    end;

    local procedure DriveCar(ICar: Interface CarInterface)
    begin
        ICar.Drive();
        OnAfterDriveCar(ICar);
    end;

    [BusinessEvent(false)]
    local procedure OnAfterDriveCar(ICar: Interface CarInterface)
    begin
    end;
}

codeunit 50102 MyCodeunit
{
    [EventSubscriber(ObjectType::Page, Page::"Customer List", OnAfterDriveCar, '', false, false)]
    local procedure PrintLoadOnAfterDriveCar(ICar: Interface CarInterface)
    begin
        if ICar is CapacityInterface then
            (ICar as CapacityInterface).GetLoad(); // Error happens here
    end;
}

interface VehicleInterface
{
    procedure Move()
}
interface CarInterface extends VehicleInterface
{
    procedure Drive()
}
interface BoatInterface extends VehicleInterface
{
    procedure Sail()
}

interface CapacityInterface extends CarInterface, BoatInterface
{
    procedure GetLoad()
}

codeunit 50100 Car implements CarInterface
{
    procedure Drive()
    begin
        Message('Car drives');
    end;

    procedure Move()
    begin
        Drive();
    end;

}

codeunit 50101 Capacity implements CapacityInterface
{
    procedure GetLoad()
    begin
        Message('GetLoad');
    end;

    procedure Drive()
    begin
        Message('Drive');
    end;

    procedure Sail()
    begin
        Message('Sail');
    end;

    procedure Move()
    begin
        Drive();
        Sail();
    end;
}

Note: Because the developers need to copy and paste the code snippet, including a code snippet as a media file (i.e. .gif) is not sufficient.

3. Expected behavior A clear and concise description of what you expected to happen.

4. Actual behavior A clear and concise description of what happened accompanied by images, animations, or a link to a video showing the issue occurring

5. Versions:

AL Language: 14.0.1070882
Visual Studio Code: 1.91.1
Business Central: W1 25.0 (Platform 25.0.21908.0 + Application 25.0.21983.0)
List of Visual Studio Code extensions that you have installed: AL Lanuguage

Final Checklist

Please remember to do the following:

[ X] Search the issue repository to ensure you are reporting a new issue
[X ] Reproduce the issue after disabling all extensions except the AL Language extension
[X ] Simplify your code around the issue to better isolate the problem

Internal work item: AB#542455

microsoft / AL

Publish failes with usage of `as` keyword #7800

Final Checklist