Why do I use rigid bodies created with Cylinder and Sphere, where Cylinder does not participate in collisions, and rigid bodies created with two Spheres are normal #196

It's hard to say for sure without seeing some code / a codesandbox, but one possible explanation is you're using shapes that don't support collision with each other.

If you're using a Trimesh shape for your environment, your issue would be using unsupported collision pairs. In cannon Cylinder and Trimesh shapes can't collide with each other at present - the collision logic for that pair hasn't been implemented.

You can find a table showing the supported collision shapes here: https://github.com/schteppe/cannon.js