I think it has to do with the width of the corner walls because I positioned myself in the corner, jumped, and before landing, I threw the metallic cube
That's interesting. When you throw something, there's a small issue that has to do with the spawned objects collision affecting players physics body. I knew about it but thought it was minor and not worth worrying about.
Now I see this short interaction with the thrown object might actually push you through the thin wall.
Thanks for pointing this out!