I wanted to make a bunch of these stars to fall into a bowl, sort of like cereal. I made the bowl and the plane passive objects and have tried different meshes (convex hull, mesh, cube…) and made the star an active one, calculated mass and when I pressed play it just fell through the bowl and the plane. I changed everything I could think of and then it started floating away, jumping from one place to another in just one frame.
here's the blender file if it helps https://pasteall.org/blend/ccd9644ea2be40c595dc929b6b3248c0
this is the first frame:
this is the second frame, with the star already miles up: