You may encounter the following known issues, which may include workarounds, mitigations or expected resolution timeframes.
Assembly.GetType("System.Net.Http.HttpClientHandler", false, true) does not find some types but finds it when ignoreCase is set to false
When trying to do GetType with ignorecase as true in some cases does not find the type but finds it when ignoreCase is set to false. This only happens in .NET7 preview 1 and does not happen in .NET 6. More information and workaround can be found at dotnet/runtime#65013
.NET 7 Preview 3 on Linux skips revocation checks for expired certificates, reporting RevocationStatusUnknown when revocation checks were enabled. You can read more about this here: dotnet/runtime#66803
.NET 7 Preview 5 on Browser WASM has implemented the SHA1, SHA256, SHA384, SHA512 algorithms using the SubtleCrypto browser-native APIs. A race condition was discovered in System.Security.Cryptography's implementation where the wrong hash value is returned unpredictably. You can read more about this here: dotnet/runtime#69806. This only happens in .NET 7 Preview 5 and has been fixed in the latest code.
dotnet format app that comes with SDK has this exception: Unhandled exception: System.IO.FileLoadException: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=6.0.0.0
Workaround:
Install dotnet-format as a global tool
dotnet tool install -g dotnet-format --version "7.*" --add-source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet7/nuget/v3/index.json
Then invoke the global tool using dotnet-format instead of through the dotnet CLI using dotnet format.
You can continue using 6.0.200 .NET SDK versions until .NET MAUI joins the .NET 7 release. See more information here: https://github.com/dotnet/maui/wiki/.NET-7-and-.NET-MAUI