wix.exe : error WIX0001: System.NullReferenceException at HarvestPackage

[icnocop]

Bugs

• Which version of WiX are you building with?
  4.0.0-rc.4

• Which version of Visual Studio are you building with (if any)?
  Visual Studio 2022 17.5.3

• Which version of the WiX Toolset Visual Studio Extension are you building with (if any)?
  N/A

• Which version of .NET are you building with?
  .net 6.0

• If the problem occurs when installing your packages built with WiX, what is the version of Windows the package is running on?
  N/A

• Describe the problem and the steps to reproduce it.
  Trying to build a bundle with an MsiPackage causes a NullReferenceException.

Bundle.wxs (minimized to reproduce the issue):

<Wix xmlns="http://wixtoolset.org/schemas/v4/wxs" xmlns:bal="http://wixtoolset.org/schemas/v4/wxs/bal">

    <Bundle
        Name="Name"
        Version="1.0.0.0"
        Manufacturer="Manufacturer"
        UpgradeCode="828AA222-7292-412E-A266-A26FAD74C490">
        <BootstrapperApplication>
            <bal:WixStandardBootstrapperApplication
                Theme="hyperlinkSidebarLicense"
                LicenseUrl=""
                SuppressOptionsUI="yes"
                ShowVersion="yes" />
        </BootstrapperApplication>

        <Chain>

            <MsiPackage
                Id="MsiPackage1"
                DisplayName="DisplayName"
                Vital="yes"
                Permanent="yes"
                DownloadUrl="http://localhost/download.msi" />

        </Chain>
    </Bundle>
</Wix>

Command:
.\4.0.0-rc.4\tools\net6.0\any\wix.exe build -ext 4.0.0-rc.4\wixext4\WixToolset.Bal.wixext.dll Bundle.wxs

Produces:

wix.exe : error WIX0001: System.NullReferenceException: Object reference not set to an instance of an object.
   at WixToolset.Core.Burn.Bundles.ProcessMsiPackageCommand.HarvestPackage() in D:\a\wix4\wix4\src\wix\WixToolset.Core.Burn\Bundles\ProcessMsiPackageCommand.cs:line 158
   at WixToolset.Core.Burn.Bundles.ProcessMsiPackageCommand.Execute() in D:\a\wix4\wix4\src\wix\WixToolset.Core.Burn\Bundles\ProcessMsiPackageCommand.cs:line 73
   at WixToolset.Core.Burn.BindBundleCommand.Execute() in D:\a\wix4\wix4\src\wix\WixToolset.Core.Burn\Bind\BindBundleCommand.cs:line 195
   at WixToolset.Core.Burn.BundleBackend.Bind(IBindContext context) in D:\a\wix4\wix4\src\wix\WixToolset.Core.Burn\BundleBackend.cs:line 23
   at WixToolset.Core.Binder.BackendBind(IBindContext context) in D:\a\wix4\wix4\src\wix\WixToolset.Core\Binder.cs:line 67
   at WixToolset.Core.Binder.Bind(IBindContext context) in D:\a\wix4\wix4\src\wix\WixToolset.Core\Binder.cs:line 40
   at WixToolset.Core.CommandLine.BuildCommand.BindPhase(Intermediate output, IReadOnlyCollection`1 localizations, IReadOnlyCollection`1 filterCultures, String cabCachePath, Int32 cabbingThreadCount, IReadOnlyCollection`1 bindPaths, Dictionary`2 bindVariables, InputsAndOutputs inputsOutputs, CancellationToken cancellationToken) in D:\a\wix4\wix4\src\wix\WixToolset.Core\CommandLine\BuildCommand.cs:line 319
   at WixToolset.Core.CommandLine.BuildCommand.ExecuteAsync(CancellationToken cancellationToken) in D:\a\wix4\wix4\src\wix\WixToolset.Core\CommandLine\BuildCommand.cs:line 152
   at WixToolset.Tools.Program.Run(IServiceProvider serviceProvider, IMessageListener listener, String[] args, CancellationToken cancellationToken) in D:\a\wix4\wix4\src\wix\wix\Program.cs:line 103
   at WixToolset.Tools.Program.Main(String[] args) in D:\a\wix4\wix4\src\wix\wix\Program.cs:line 48
Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
   at WixToolset.Core.Burn.Bundles.ProcessMsiPackageCommand.HarvestPackage() in D:\a\wix4\wix4\src\wix\WixToolset.Core.Burn\Bundles\ProcessMsiPackageCommand.cs:line 158
   at WixToolset.Core.Burn.Bundles.ProcessMsiPackageCommand.Execute() in D:\a\wix4\wix4\src\wix\WixToolset.Core.Burn\Bundles\ProcessMsiPackageCommand.cs:line 73
   at WixToolset.Core.Burn.BindBundleCommand.Execute() in D:\a\wix4\wix4\src\wix\WixToolset.Core.Burn\Bind\BindBundleCommand.cs:line 195
   at WixToolset.Core.Burn.BundleBackend.Bind(IBindContext context) in D:\a\wix4\wix4\src\wix\WixToolset.Core.Burn\BundleBackend.cs:line 23
   at WixToolset.Core.Binder.BackendBind(IBindContext context) in D:\a\wix4\wix4\src\wix\WixToolset.Core\Binder.cs:line 67
   at WixToolset.Core.Binder.Bind(IBindContext context) in D:\a\wix4\wix4\src\wix\WixToolset.Core\Binder.cs:line 40
   at WixToolset.Core.CommandLine.BuildCommand.BindPhase(Intermediate output, IReadOnlyCollection`1 localizations, IReadOnlyCollection`1 filterCultures, String cabCachePath, Int32 cabbingThreadCount, IReadOnlyCollection`1 bindPaths, Dictionary`2 bindVariables, InputsAndOutputs inputsOutputs, CancellationToken cancellationToken) in D:\a\wix4\wix4\src\wix\WixToolset.Core\CommandLine\BuildCommand.cs:line 319
   at WixToolset.Core.CommandLine.BuildCommand.ExecuteAsync(CancellationToken cancellationToken) in D:\a\wix4\wix4\src\wix\WixToolset.Core\CommandLine\BuildCommand.cs:line 152
   at WixToolset.Tools.Program.Run(IServiceProvider serviceProvider, IMessageListener listener, String[] args, CancellationToken cancellationToken) in D:\a\wix4\wix4\src\wix\wix\Program.cs:line 103
   at WixToolset.Tools.Program.Main(String[] args) in D:\a\wix4\wix4\src\wix\wix\Program.cs:line 48
   at WixToolset.Tools.Program.<Main>(String[] args)

• Describe the behavior you expected and how it differed from the actual behavior.

I expected the wxs file to be validated and indicate the SourceFile or Name is required.

Thank you.