Why does Unreal game simulation freeze with certain game characters?

I’m working on making a simple racing game for a personal project. I already have one vehicle in the game setup to move around, and it works fine. But when I import in a second vehicle, using the exact setup as the first, my simulation of the game will seem to freeze. To be clear, I have my player start node hovering over my track in the level, and when I simulate the game with my first vehicle it will fall, make contact with my ground, and I am able to control it with the inputs I have setup. But when I do the same with the second vehicle, it will just freeze in midair and not do anything.