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

[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 .

2. 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.

EXPECTED
No problems have been detected in the workspace