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PostDeployment script with SQLCMD :R is failing build

See original GitHub issue

SqlPackage or DacFx Version: 0.1.3 -preview
.NET Framework (Windows-only) or .NET Core: 6.0.3
Environment (local platform and source/target platforms): Windows 10, Azure Data Studio

Steps to Reproduce:

Create new SQL Server Database project in azure data studio.
Add folder and files that is not supposed to be built.
Change your sqlproj file to look something like this

<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="4.0">
  <Sdk Name="Microsoft.Build.Sql" Version="0.1.3-preview" />
  <PropertyGroup>
    <Name>DBName</Name>
    <ProjectGuid>{961FE558-959F-46CE-A911-5FE5B0779667}</ProjectGuid>
    <DSP>Microsoft.Data.Tools.Schema.Sql.Sql150DatabaseSchemaProvider</DSP>
    <ModelCollation>1033, CI</ModelCollation>
  </PropertyGroup>
  <Target Name="BeforeBuild">
    <Delete Files="$(BaseIntermediateOutputPath)\project.assets.json" />
  </Target>
  <ItemGroup>
    <PostDeploy Include="Script.PostDeployment.sql"/>
  </ItemGroup>
  <ItemGroup>
    <Build Remove="Users\somescript1.sql"/>
    <Build Remove="Users\somescript2.sql"/>
    <Build Remove="Users\somescript3.sql"/>
    <Build Remove="Users\somescript4.sql"/>
    <Build Remove="Users\somescript5.sql"/>
  </ItemGroup>
</Project>

Add PostDeployment with SQLCMD :r targeting your files that is removed from the build.
Try build project with: dotnet build /p:NetCoreBuild=true from cmd or build action from Azure Data Studio
Build fails due to post deployment script.
Output:

...DBName\Users\somescript1.sql(3,6,3,6): Build error SQL72008: Variable x is not defined. [...DBName\DBName.sqlproj]
...DBName\Users\somescript2.sql(12,25,12,25): Build error SQL72008: Variable x is not defined. [...DBName\DBName.sqlproj]
...DBName\Users\somescript3.sql(12,25,12,25): Build error SQL72008: Variable x is not defined. [...DBName\DBName.sqlproj]
...DBName\Users\somescript4.sql(12,25,12,25): Build error SQL72008: Variable x is not defined. [...DBName\DBName.sqlproj]
...DBName\Users\somescript5.sql(19,22,19,22): Build error SQL72007: The syntax check failed 'Incorrect syntax near ].' in the batch near: [...DBName\DBName.sqlproj]

(DacFx/SqlPackage/SSMS/Azure Data Studio)