Derived struct data is not copied to Base struct

The actor Blueprint is intentionally causing an object slice to occur. In other words, we're copying a derived type to a base type, so the expectation is that only the inherited base properties are copied from the derived type.

In this case, that doesn't happen at all. SetStructurePropertyByName seems to be a bit aggressive with checking that UScriptStructs match. Checking that they're from the same hierarchy should be sufficient, but we'll need to validate.

1. Download and unzip attached project
2. Build an run editor
3. Run MainLevel in PIE
4. Observe that -1.0 is printed to the HUD
5. Expected behavior: 10.0 is printed to the HUD