Entity state "Detached"

[Henning34]

When fetching an entity using the cache the entity state is "Detached" and not "Unchanged" as expected.

Steps to reproduce

A first call to

var product = _context.Product.Where(p => p.Id == request.ProductID).Cacheable(TimeSpan.FromMinutes(10)).FirstOrDefault();
var state = _context.Entry(product).State;

Has the result: "Unchanged"

The second call (using the cache) results in : "Detached" !

When using the product reference as relation, the next call to SaveChanges() fails as it tries to insert the entity a second time.

Further technical details

Using the cache in an asp.net core application with dependency injection