Type.GetInterfaceMap(Type) does not throw for open generic types

### Description

According to [the docs](https://learn.microsoft.com/en-us/dotnet/api/system.type.getinterfacemap?view=net-7.0):

> Exceptions
> [ArgumentException](https://learn.microsoft.com/en-us/dotnet/api/system.argumentexception?view=net-7.0)
> ...
> The current instance or interfaceType argument is an open generic type; that is, the [ContainsGenericParameters](https://learn.microsoft.com/en-us/dotnet/api/system.type.containsgenericparameters?view=net-7.0#system-type-containsgenericparameters) property returns true.

The `current instance` I guess it refers to the type on which the method is called, which in my examples below is always an open type, and it does not throw for that.
While the `interfaceType argument` only throws if I manually write it as an open generic, while if I retrieve it through reflection it does not.

### Reproduction Steps

See fiddle: https://dotnetfiddle.net/8698i5

### Expected behavior

According to the docs it should always throw

### Actual behavior

It throws only if both types are specified as open generics through `typeof()` and not via reflection

### Regression?

_No response_

### Known Workarounds

_No response_

### Configuration

_No response_

### Other information

_No response_