The position of the train are weird when pitch is small

[johnskywalk]

Thank you for your wonderful app!!

I have tried to show your app by copying and pasting your source code, but the behavior is something weird.

When the pitch is high, the behavior is good. But when the pitch is small, the position of train is weird.

Do you have any kind of ideas that cause this problem?

https://github.com/nagix/mini-tokyo-3d/assets/158731467/0c12926c-dd25-4931-ba5a-393cb87ca9b2

Your kind help is very appreciated!