Invisible collider at 0,0,0 in empty scene bug?

Investigating why my character was hitting a bump when spawning at 0,0,0 and seeing some collision even in an empty scene with default cubes with rigidbodies. Anyone have any info here? There are no colliders except the floor (box collider) and each cube having a box collider and rigidbody. It only happens at 0,0,0 coordinates. Unity 2022.3.34 version.

BumpBug1
BumpBug2

Update: I logged the OnCollisionEnter and it claims it is colliding with an object that is not in the scene. Specifically JiggleBoneSphereCollider which is an asset I was using, but is not present in this scene.

Most likely that asset is badly written and/or working under assumptions, so it’s adding something to your scene. When adding elements to an scene, the code can make them hidden so they don’t appear in the hierarchy (HideFlags).