CharacterBody3D and Rigidbody3D

Help Physics
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1

Godot Version

Godot 4.3

Question

Every time I try to walk down a rigidbody object as a characterbody3d, the body just rotate and even fly away. I changed the mass to 10k kg, still have. Many people want me to make it static, but my idea is to make the player push the box and stand on it to climb up a high ground. How can I fix it ?
I am using the Godot 4 character controller template.
Here is a video clip showing the problem

2

Its still looks like its too lightweight. Try increasing the mass more

3

Try increase the mass and lock the rigid body rotation.

4

It works, thank you so much !