C# doens't propose me using namespace or framework installed related to add them automatically to the class

[TheBanker1710]

Environment data

dotnet --info output:
VS Code version:
C# Extension version:

Steps to reproduce

Expected behavior

Actual behavior

[TheBanker1710]

n fact, I'm following a tuto on Udemy about .NET CORE and Angular, and the C# extension or Visual Code doesn't show me the quick fix when there is an error. It doesn't underline the error, it seems it doesn't recognize the new classes added and the new framework added too.

[TheBanker1710]

It doesn't recognize new classes or new packages added :/ I don't know what to do :/ Here before, I'm simulating an error with making a fault in the using DatingApp.API. and no errors are shown...

[cartermp]

Closing as duplicate of #3738