Execution alias for hosted application

I am trying to create a hosted application (i.e. with a HostId attribute) with an execution alias. The hosted application in general works, i.e. I can launch it from the start menu link that is generated. The execution alias is being generated, but when I try to run it I get an error saying

PS> foobarasdf.exe
ResourceUnavailable: Program 'foobarasdf.exe' failed to run: An error occurred trying to start process 'C:\Users\david\AppData\Local\Microsoft\WindowsApps\foobarasdf.exe' with working directory 'C:\Users\david\source\juliaup'. The file cann
ot be accessed by the system.At line:1 char:1                                                                                                                                                                                                   + foobarasdf.exe
+ ~~~~~~~~~~~~~~.

The app manifest that I'm using is this

<?xml version="1.0" encoding="utf-8"?>
<Package
  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
  xmlns:desktop="http://schemas.microsoft.com/appx/manifest/desktop/windows10"
  xmlns:desktop4="http://schemas.microsoft.com/appx/manifest/desktop/windows10/4"
  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
  xmlns:uap5="http://schemas.microsoft.com/appx/manifest/uap/windows10/5"
  xmlns:uap10="http://schemas.microsoft.com/appx/manifest/uap/windows10/10"
  xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
  IgnorableNamespaces="uap uap10 rescap build"
  xmlns:build="http://schemas.microsoft.com/developer/appx/2015/build">

  <Identity Name="StringBuildersManifest"
    Publisher="CN=Julialang, OID.2.25.311729368913984317654407730594956997722=1"
    Version="1.0.0.6" />

    <Properties>
        <DisplayName>Number Guesser (Manifest)</DisplayName>
        <PublisherDisplayName>AppModelSamples</PublisherDisplayName>
        <Logo>Images\StoreLogo.png</Logo>
    </Properties>

  <Dependencies>
    <TargetDeviceFamily Name="Windows.Desktop" MinVersion="10.0.19041.0" MaxVersionTested="10.0.19041.0" />
    <uap10:HostRuntimeDependency Name="JuliaHubInc.JuliaDev" Publisher="CN=&quot;JuliaHub, Inc.&quot;, O=&quot;JuliaHub, Inc.&quot;, L=CAMBRIDGE, S=Massachusetts, C=US" MinVersion="1.0.0.0"/>
  </Dependencies>

  <Applications>
    <Application Id="StringBuildersApp"  
      uap10:HostId="JuliaHost"
      uap10:Parameters="--project=C:\Users\david\.julia\dev\StringBuilders\app">
      <uap:VisualElements
        DisplayName="Stringbuilders"
        Description="Stringbuilders is a high-level, high-performance, dynamic programming language"
        BackgroundColor="transparent"
        Square150x150Logo="Images\Square150x150Logo.png"
        Square44x44Logo="Images\Square44x44Logo.png">
        <uap:DefaultTile
          Wide310x150Logo="Images\Wide310x150Logo.png"
          ShortName="Julia"
          Square71x71Logo="Images\SmallTile.png"
          Square310x310Logo="Images\LargeTile.png">
          <uap:ShowNameOnTiles>
            <uap:ShowOn Tile="square150x150Logo"/>
            <uap:ShowOn Tile="wide310x150Logo"/>
            <uap:ShowOn Tile="square310x310Logo"/>
          </uap:ShowNameOnTiles>
        </uap:DefaultTile >
        <uap:SplashScreen Image="Images\SplashScreen.png" />
      </uap:VisualElements>
      <Extensions>
        <uap5:Extension Category="windows.appExecutionAlias">
          <uap5:AppExecutionAlias>
            <uap5:ExecutionAlias Alias="foobarasdf.exe" />
          </uap5:AppExecutionAlias>
        </uap5:Extension>
      </Extensions>
    </Application>

  </Applications>

<Capabilities>
        <rescap:Capability Name="runFullTrust" />
        <rescap:Capability Name="unvirtualizedResources"/>
    </Capabilities>
</Package>

Should this kind of approach in general work? Any hints what I'm doing wrong would be greatly appreciated!