microsoft-authentication-library-for-dotnet: [Bug] "email" scope forces token refresh even if there are valid cached tokens

MSAL 4.7.1 net45

• Desktop / Mobile
  • Interactive
  • Integrated Windows Auth
  • Username Password
  • Device code flow (browserless)

I use the following code to initialize IPublicClientApplication:

var client = PublicClientApplicationBuilder.Create(strClientId).Build();
client.UserTokenCache.EnableSerialization();

Where the implemetnation of UserTokenCache.EnableSerialization() is taken from here: https://docs.microsoft.com/en-us/azure/active-directory/develop/msal-net-token-cache-serialization#simple-token-cache-serialization-msal-only

Then I get a token multiple times using this line:

var authResult = await client.AcquireTokenSilent(new string[] {strCustomScope, "email"}, cachedTokenAccount).ExecuteAsync()

I get new tokens every time, even if I have valid (not expired) tokens in the cache. Because of that I get error introduced by this update: https://docs.microsoft.com/en-us/azure/active-directory/develop/reference-breaking-changes#march-2019

Removing “email” scope fixes this and I get tokens from the cache if not expired.