It’s the same thing we saw with Halo CE Anniversary on the Xbox 360.

Edit:

you can downvote me all you want. That’s not how game engines work.

Just so we’re clear, that edit wasn’t there when I made this comment. Bro edited in a double-down even after getting real-world examples that are over thirteen years old. It takes a crazy kind of confidence to stare reality in the face and say, “Nah, I don’t like that, so it doesn’t exist.”

Halo CEA used the original Blam Engine as a backend and Sabre’s engine in the frontend, it just made the new rendering engine toggleable. Sonic Colors Ultimate did the same thing, too: the backend is the Hedgehog engine and the frontend is Godot.