If you create multiple engines with the same name, and then select any of those engines during game development, you’ll only be able to use features from the first engine you make in the game… Which is almost no features.
This problem has apparently been reported in 2015 by another player. I find it weird it never got fixed in 3 years.
I started a new game today and created 4 engines with the same name, each engine had better graphics and more features than the previous one. I could use the newest graphics, but almost every feature was unavailable. It didn’t stop me from getting 9+ review scores of course.
I now created a 5th engine with a different name and I am finally able to use the features.