Rounding error on last hierarchy component

[bug-rounding-error.zip](https://github.com/user-attachments/files/26061229/bug-rounding-error.zip)

Opening this file yields this very suspicious error:

<img width="713" height="200" alt="Image" src="https://github.com/user-attachments/assets/ea629acd-532b-4107-8497-eb31af961b0b" />

I got a similar error when trying to split that component, but I wasn't able to reproduce.



