Model corrupted in exported .step file

## To Reproduce
This is what I'm trying to make:

A solid pipe with 4 parts, and 3 rings.

### Result

In cq-editor: okay
Export stl: okay
**Export step: broken**

Code and exported models:

[bugreport-cq-project.zip](https://github.com/user-attachments/files/21400507/bugreport-cq-project.zip)

## Environment

OS: Linux

Using pip installed cadquery and cq-editor
```
$ pip3.11 list|grep -E "cadquery|cq-editor" -i
cadquery 2.5.2
cadquery-ocp 7.7.2
CQ-editor 0.5.0
```