Entity Framework Core 3.0 Preview 4 

Today, we are making the fourth preview of Entity Framework Core 3.0 available on NuGet, alongside .NET Core 3.0 Preview 4 and ASP.NET Core 3.0 Preview 4. We encourage you to install this preview to test the new functionality and assess the impact of the included breaking changes.

情報源: Announcing Entity Framework Core 3.0 Preview 4 | .NET Blog

Memo.