Including multiple semicolon-separated strings removes slash on Linux

[tmat]

Steps to reproduce

Project file a.proj:

<Project>
  <Target Name="Build">
    <PropertyGroup>
      <_Value0>/tmp/RoslynTests/5b60c3b6-f6b5-431b-a782-fc3f8a5eea90/</_Value0>
      <_Value1>https://raw.githubusercontent.com</_Value1>
    </PropertyGroup>
    <ItemGroup>
      <LinesToWrite1 Include="$(_Value0);$(_Value1)"/>
      <LinesToWrite2 Include="$(_Value0)"/>
      <LinesToWrite2 Include="$(_Value1)"/>
    </ItemGroup>
    <WriteLinesToFile File="Result1.txt" Lines="@(LinesToWrite1)" Overwrite="true" Encoding="UTF-8" />
    <WriteLinesToFile File="Result2.txt" Lines="@(LinesToWrite2)" Overwrite="true" Encoding="UTF-8" />
  </Target>
</Project>

Command line

> dotnet msbuild a.proj

Expected behavior

Content of Result1.txt and Result2.txt is the same:

/tmp/RoslynTests/5b60c3b6-f6b5-431b-a782-fc3f8a5eea90/
https://raw.githubusercontent.com

Actual behavior

Result1.txt:

/tmp/RoslynTests/5b60c3b6-f6b5-431b-a782-fc3f8a5eea90/
https:/raw.githubusercontent.com

Result2.txt:

/tmp/RoslynTests/5b60c3b6-f6b5-431b-a782-fc3f8a5eea90/
https://raw.githubusercontent.com

Environment data

msbuild /version output:

Microsoft (R) Build Engine version 15.7.177.53362 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

OS info:

• Fails on Ubuntu.
• Works on Windows

[cdmihai]

Probably a duplicate of #1622