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[WebToolsE2E][Green] After installing C# and C# Dev Kit, will encounter warning: "Found markup element with unexpected name 'PageTitle'" in Blazor Web App. #9473

Description

@v-korosales

REGRESSION INFO: Works well In April release C# DK 3.20.199(C#2.140.9)
INSTALL STEPS

OS: Mac x64
Install the SDK 8.0.423
Install VS Code insiders - 1.126.0
Install May prerelease 6 candidate C# devkit 3.21.235(C#2.145.15)

Platform

  • Windows
  • Linux
  • Mac

REPRO STEPS

  1. Open a normal Terminal Emulator, create Blazor project and open it using VS code insiders
md Blazor
cd Blazor
dotnet new blazorserver
code-insiders .
  1. Open Components/Pages/Home.Razor

ACTUAL
Found markup element with unexpected name 'PageTitle'. If this is intended to be a component, add a @using directive for its namespace.
Image

EXPECTED
No problems have been detected in the workspace
Image

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