Route handlers throw System.Text.Json.JsonReader exception for requests with invalid JSON body rather than returning 422

[DamianEdwards]

Consider the following minimal API:

app.MapPost("/todos", (Todo todo) =>
{
    // Do something with todo here...
});

class Todo
{
    public string? Text { get; set; }
}

Sending a request with invalid JSON body but that is otherwise well-formed results in a 500 response, due to the underlying JSON reader exception not being handled by the framework:

We should likely be returning a 422 Unprocessable Entity instead.

[DamianEdwards]

MVC (with ApiController) responds with a 400 in this scenario (the Problem Details is due to the convention applied to ApiController instances):