Error deploying Angular app to Azure related to zip dwasmod.dll

I have an Angular app that I build and deploy using Azure Dev Ops to an Azure App Service (Node.js on Windows). I am creating a zip file for in the ADO build pipeline with this azure-piplines.yml step:

- task: ArchiveFiles@2
displayName: 'Zip deployment package'
inputs:
rootFolderOrFile: '$(Build.SourcesDirectory)/dist/browser' # Folder to zip
includeRootFolder: false
archiveType: 'zip'
archiveFile: '$(Build.ArtifactStagingDirectory)/deployment.zip' # Output zip file
replaceExistingArchive: true



I'm deploying it in the deployment pipeline with this step:

- task: AzureWebApp@1
displayName: 'Deploy to Azure App Service'
inputs:
azureSubscription: xxxx
appType: 'webApp'
appName: xxxx
package: '$(Pipeline.Workspace)/drop/deployment.zip'


On deployment there is an error. The relevant info in EventLog.xml is:

Failed to load dwasmod.dll​

Azure "Diagnose and solve problems" doesn't even recognize that the event occurred. The "Support + Troubleshooting" rabbit-hole yielded nothing of use either.

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