.NET Full Framework vs. .NET Core SynchronizationContext

AspNet Full-framework Api

framework deadlock/operation	async/await any thread	async/await same thread	async blocking any thread	async blocking same thread
.NET Standard 2.0	❌	❌	❌	✔️
.NET Framework v4.7.2	❌	❌	❌	✔️

Testing the Api: https://localhost:44389/api/values/net-standard/async?configAwait=false - Ok https://localhost:44389/api/values/net-standard/async?configAwait=true - Ok

https://localhost:44389/api/values/net-standard/sync?configAwait=false - Ok https://localhost:44389/api/values/net-standard/sync?configAwait=true - Deadlock

https://localhost:44389/api/values/full-framework/async?configAwait=false - Ok https://localhost:44389/api/values/full-framework/async?configAwait=true - Ok

https://localhost:44389/api/values/full-framework/sync?configAwait=false - Ok https://localhost:44389/api/values/full-framework/sync?configAwait=true - Deadlock

AspNetCore Api

framework deadlock/operation	async/await any thread	async/await same thread	async blocking any thread	async blocking same thread
.NET Standard 2.0	❌	❌	❌	❌
.NET Framework v4.7.2	❌	❌	❌	❌

Testing the Api: dotnet test