Certain MSBuild configuration causes _wpftmp build output directories to not be deleted after each build
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WindowsDesktop SDK
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Description
.NET Core 3.1.201
Windows 10 build 18363
**Problem description:**
Certain MSBuild configuration causes the compiler to leave behind directories with a `_wpftmp` suffix after a build completes. The problem seems to be related to custom ``s.
**Actual behavior:**
Temporary output directories are left behind after every build. A new directory is created per build.
**Expected behavior:**
Temporary output directories are deleted after every build.
**Minimal repro:**
[WpfApp1.zip](https://github.com/dotnet/wpf/files/4526132/WpfApp1.zip)
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