Can not build/pack 32 bit add-in using dotnet CLI

when building the 32 bit add-in using dotnet CLI
`dotnet build -r win-x86 -c Release -p:EnvironmentName=PRD -p:Platform=x86 --sc false`
I get the same error as in #329
`could not be packed. Possibly a mixed assembly? (These are not supported yet.)`
I do not get any errors when I create a 64 bit add-in
`dotnet build -r win-x64 -c Release -p:EnvironmentName=PRD -p:Platform=x64 --sc false`
And I can create a 32 bit build without error if I build through Visual Studio UI, but I need the .net CLI for deploying the project to production via Azure Devops.

you can replicate this error with an empty library project with these settings:
```

net6.0-windows
x86;x64
false
true
true
true

true
false


false
true

@(References)

```